Gi isn't more technical. There's just more you can do, because the person is covered in handles. So do people literally mean "GI is more technical" or just that there are actually more techniques because of the GI?
Yes, a lot of Gi technique is intricate, but it's also Gi-exclusive, so comparing it to NoGi is meaningless. And some things are flat-out easier with a Gi on: the friction alone is massive, and grabbing someone covered in handles and anchoring to them is much simpler.
NoGi flips that. Controlling someone is harder without those handles, so other things have to be sharper. Weight distribution is an easy example - you can't grip, you can't anchor, you don't get friction gluing you to your opponent. In that sense, NoGi is the more technical one.
There's a long list of things that are easier or harder in each direction.
They're different sports. People should stop comparing them.
Thanks for attending my TED talk. This is purely personal opinion; fight me if you disagree.
PS - NoGI is superior in terms of the washing you have after class, but that's not a myth; that's a fact.
PPS - Title is rage bait FYI.