What it lacks is the ability to Quote Tweet, that is to add your own comments to what somebody may have said, which is often used in social mobilizing. It also doesn't have full text search. This was all done intentionally. But as a result, it's much harder to reach out of your networks to other people. I used Twitter to follow multiple social movements, as well as to learn about people in other countries. Mastodon isn't useful for any of that. And it doesn't want to be.