I don't use Pico-8, and I find its limitations frustrating; I am never going to make a game in Pico-8. But I do use stuff like Jummbox when I compose music, for basically the same exact reasons other devs use Pico-8 for games, and I love Jummbox's limitations for music composition.
Limitations are a way of fostering community (ham radio enthusiasts all kind of get to know local operators, Jummbox makes sharing song sources in a digestible way super-easy). Limitations also allow you to not care about complications that would be barriers to building things -- I don't want to set up a VST before I start writing music.
So my feeling on Gemini has shifted from being a curmudgeon about honestly kind of really nitpicky, shallow stuff like the ability to mark-up inline language transitions -- into realizing that when you step away from thinking of the project as some kind of attack on the web then yeah, it actually makes a ton of sense to build a small community around a very limited format that forces everyone in that community to be standardized in how they share with each other, keeps the community a little bit niche so that the people in it are a bit more friendly and personable, and forces its participants to focus pretty much only on what they're writing and nothing else.