I think you're making the mistake that just because people on the forum have the skills, knowledge, and general capacity to learn a new tool that they are convinced to put in the effort to learn the new tool. Social media specifically has thrived on a culture of extreme low effort to learn how to start having fun with it (think TikTok showing you cool videos, then an easy prompt to sign up, then an immediate "for you" page before you ever need to engage with the TikTok community like commenting, liking, following, etc).
The fediverse (and decentralized social media in general) breaks the mold of extreme ease of use and therefore subverts the cultural expectations, thereby violating one of the ways a user would establish if the application is "good", and thereby it looks "bad".
It's like, technically X algorithm is a superior algo to use. But I can import Algo Joe's library that's 50 years old and already integrated into every language I know, so I'll do Joe.Sort().