You really don't understand why someone would prefer Mastodon because of its decentralized and open source nature, but would like to take some of the things they like about Twitter and include it in their Mastodon experience?
> Playing into people's FOMO
This implies that the only form of "algorithmic feed" is one where clickbait and inflammatory content is maximized.
An algorithmic feed can also mean something like a "for you" feed that tries to find you posts you'd find interesting based solely on your current follows, but from other accounts you're not following.
It can also mean a "what you missed" feed like the one Twitter used to have, that shows you the top posts from your follows since the last time you logged in. If someone doesn't open mastodon for a week because they were on vacation, it's not feasible for them to scroll through an entire weeks worth of posts to "catch up".
Understand that people have a wide variety of experiences they'd like to get out of social media, and that this whole mentality of "my idea of a social network is the most enlightened and correct one, and everyone else is stupid" just feeds into the stereotype of the socially inept engineer.