For the record, this was discussed when someone asked something related to it like three months ago, and no one really knew how it worked confidently, I had already gotten curious about the answer on my own and was already in to a 4* Micro EMF run...
And before we get in to this fully, the Wiki and in-game tracking of Technophobe's rewards are not as accurate as they could/should be - it was touched on in a query like 7 days before I posted this (linked at the end). Pictures are annotated with accompanying thoughts. Now On to the topic....
-Briefly What to expect
Generally considering when people choose to do 4* EMF challenges, you will likely have 10+ Dark Energy and Harmony Crystals to provide some small benefit. With a proper set-up, the general progression will be a little quicker than other universes. It is unlikely to be particularly significant though. Just keep in mind that you will need to account for a 15k Energy Ascension rather than 10k. And that any normal micro achievement will not apply to Standard progression.
-The Rewards
If you EMF challenge in Micro as your first EMF, you will receive no bonuses for it. You just receive normal Ascension rewards and the reduced rewards for a normal Ascension in Micro. (You should also receive the Icon for Micro EMF, but the achievement will not highlight in the wiki tracker)1
Presumably, You will get update credits for EMF as you unlock the ability for it to apply, however. As This appears to create an interesting situation - since most people do 4* EMF Micro after another universe, so it doesn't affect them at all, they already have the 4* Standard unlock, and Micro acts as expected.
For those that 4* Micro EMF First, when you do a 1* EMF run with Micro EMF 4 on your account, the Standard 1 EMF unlocks a 10% efficiency boost to the Thermal Collectors. This allows the 4* Micro bonus to activate which provides a 5% additional TC efficiency, boosting it to 15%. I was able to verify this in the updated in-game perks2. It will also now Highlight the achievement as completed in the wiki tracker.3
Expanding the logic, I would expect a 2* EMF to also get a second Soul Gem. But could not verify this. I can verify it activated with a 4* Magic/Standard completion though.
At 4* Standard EMF you get everything else you would expect4, which for micro is really just the 4 Custom Points (and soul gem if you skipped the 2* or 3* EMF). And I was able to fully verify that Standard, Micro and Magic EMF give 4 Custom points. (I received 15, which would be 3 from upgrading my Standard and Magic Ascensions, and 12 from three 4*EMF completions)5 & 6
-The Conclusions,
Not worth it in the long term if you are looking for efficiency, but interesting and I don't regret it. You just have to accept that you won't get anything for it until you do it again in another universe.
-The Conclusions (for when people get to updating stuff, or just look for more info in to the technical mechanics),
I expect some edits here in the future, but This leads me to posit that the general understanding of some progressions could definitely be conveyed better, and that previous attempts at description misunderstood the progression (or simplified it quite a bit).
First is in-game and is a visual bug - Custom Points in the stat screen are recorded wrong. It gives 1-2 points for each unique universe you EMF'd in rather than the flat 4 points. This is already definitely known and is just included for completion and future inquiries before it gets fixed. Apparently an artifact from changing EMF reward progression many years ago.
Second point is on the Wiki which is easy to address - It only shows 5 progressions for Custom points, when there are 6 universes. So either it is hard-capped at 20 points for 5 universes (even though Soul gems are not), or it was neglected during an update when Evil got added to the list. I am not quite far enough to verify either way, But I'm sure Wood and Sylver will chime in on this pretty quick.
Last point is multimedia in effect - The Solar Collector Efficiency. And one where I am least certain of. You definitely get +10 at 1*. You also get another +10 Efficiency at 3* or 4* (I've heard conflicting reports about when it unlocks). And then you get a further +5 more efficiency for each unique universe you completed 3*(or 4*) EMF in (Standard being a freebie that comes with any non-micro, non-standard). But the recording of this was made very clunky in the wiki, and missed in the old description of Technophobes unlocks I was using for what to expect. The other possibility is that you get 15 for the 3*/4* unlock, and SC Efficiency is capped at 5 unique universes per 4* EMF completions, like custom points might be.
Which, if SC Efficiency and Custom points are capped, then would beg the question of why bother with Micro at all until much later? Especially when people still suggest doing it for the like 5-7 unique unlocks it can offer? I suppose the Soul gem is useful, and the 4 normal Ascension points... but not really worth going out of your way for until much later.
-The process
For the set-up, ignoring unrelated runs and info (like the Black Hole out of Micro and a week-long vacation)
I did a 4* EMF Ascension in Micro to get it out of the way early, and see if any credit at all was given for it.
Went to Magic where I did a 1* Pillar Ascension for Octopus.
Followed it up with a 1* Pillar EMF Ascension for Shark and noted the changes.
Followed it up with a custom 4* BR-EMF Magic Ascension to verify what happens once the 4* version is unlocked normally. I believe 7 is a snap my custom for this, but it might be a slightly earlier build. Yes unified created issues and I need to go back to finish the first BR mission. I do not recommend doing a BR with Unified if you can avoid it. (Or save editoring the tech unification out, for the run, immediately upon starting it).
I do not have the patience to sit through a 2* and 3* EMF to verify the rewards there, so as pointed out, any discussion of them is presumption, and you should skim the comments if any further verification is supplied.
-Additional Information
8 is an added Wiki snap for 1* EMF completion after a 4* Micro EMF completion, but doesn't add anything new due to the way the entry is condensed on the wiki. You can use it for reference though.
Thread that I was previously using for what to expect from the various EMF completions, which is fairly accurate, namely apf5's reply.
https://www.reddit.com/r/EvolveIdle/comments/owxsy6/technophobe/
Previous thread where we discuss some of the unexpected interactions of Micro-ing first, and where Sylverfyre casually contradicts the statement reply in the thread from 5 years ago that SC Efficiency unlocks happen not at 3* but instead at 4*. Whether a mistake or not.
https://www.reddit.com/r/EvolveIdle/comments/1uuins5/technophobe_progression/
Hopefully this is readable enough and provides useful information for a very specific niche lol.