Of course there are extension devs who left GNOME due to the lack of a stable API. But they were all looking for something that was inherently not possible with how extensions work in GNOME. I can't blame them, "extensions" is a misnomer in this case after all. It's actually more like userscripts being applied on a web page in a browser.
If possible, take the time to read the link in my earlier comment, it should clear up a lot of misunderstandings about "GNOME devs intentionally breaking extensions" as most people seem to think of it as.
Given how extensions work (monkey-patching), it's actually really impressive that most extensions haven't really broken since GNOME 45 and the steps taken by GNOME to that end are impressive. Even the human review being discussed here is part of that, it's exactly because an extension can literally bring down a user's shell (also similar to how a web page can crash due to a userscript), so they're trying to reduce the chances of that happening.
GNOME has always had a bit of a communication problem. They're working on it. But I promise you, they're all wonderful folks trying their best, even if they fail to convey that well sometimes.