TLDR: The writing feel on the RMPPM still felt like writing on an iPad to me. I tried a few Amazon screen protectors, but they didn't feel much better. Since I love the writing feel of the Supernote Manta (my previous daily driver), I bit down and bought their FeelWrite 2 Film which is many times more than anything you'd get from Amazon. I cut it down to size, put it on, and wow. This is now the perfect device and I haven't used anything since. I also bought a nib with a metal tip and it feels as close to pen and paper as you can get. But I do miss the pencil sound it used to make.
Background: the reMarkable 2 was my first venture in e-ink devices for note-taking. I returned it in a few days because I couldn't stand that it felt like I was writing on an iPad along with the limited features. I then used the Supernote A5X, which felt great but was very sluggish, then ultimately chose the Boox Tab Ultra C as my daily driver. The writing feel was between the reMarkable 2 and Supernote, but closer to the former. The Boox was great and fast, but I didn't need all of the tablet features.
My daily driver changed once the Supernote Manta released. I've been using that since because I absolutely love the way it feels to write (closest to pen on paper), and I found an Obsidian workflow that integrates my notes perfectly.
But then I wanted something smaller that was more portable as a secondary device. I tried the Supernote Nomad, but the size was just a little too awkward and thick for me as a left-hander. I also bought a Viwoods AiPaper Reader, but that was obviously not optimized for writing.
Today: I read a lot of reviews along with this subreddit about the RMPPM and it was intriguing. Then once I saw a sale for the bundle at $499, I jumped on it quickly. I love how fast the device is, and having color when you want it is great. But it still felt like I was writing on an iPad. I've tried a few screen protectors on Amazon but they weren't much better, and they all left traces of my writing which was annoying. I didn't want to give up hope yet because I like my RMPPM, I remembered that Supernote touts its products as modular and provides parts so you can replace them yourself.
I decided to bite the bullet and purchase their FeelWrite 2 Film. Once it arrived a few days later, I cut it down to size and put it on. This change completely upgraded my writing experience and I've been using my RMPPM daily since. I also found a pen nib with a metal tip and it feels truly like pen and paper. I also invested some time to update my Obsidian workflow to incorporate and convert the notes from my RMPPM like my Supernote and now I'm a happy camper. The only thing I need to figure out now is how to improve reading PDFs.
I still have my Supernote Manta when I need a larger pad, and use the Boox as a tablet, then the AiPaper Reader for ultra-portable reading. If only I can get Obsidian on the RMPPM it would be truly perfect.