Good post. On the other hand, IMHO (as a non-Fedi-expert I should say), I think the Fediverse does not absolutely need to appeal to everyone. A lot of people are happy with Twitter, and a lot of people are happy with Facebook. Evolving Mastodon into a clone of Twitter is perhaps missing the point of building a different platform in the first place. Not to say there's no place for new ideas or criticism of course...
To add after reading the post again: A centralized social media site with a professional content moderation team is, of course, always going to provide a better experience to new users. I don't think a decentralized platform will ever be able to compete, by design. "Full text search" and "quote posts" are not going to help when someone accidentally joins a poorly moderated instance.