As a new Mastodon user coming from Twitter, here is what I find most user-unfriendly.
1. Layout which doesn’t distinguish between original post and a reply to it. Very confusing.
2. Can’t figure out how to read a thread in sequence. Maybe my fault?

Twitter screenshot for comparison.
Maybe incorporate a few of the good design features of Twitter here? They didn’t get everything wrong!

Thanks to all for the suggestions! I’m trying Metatext and I like the layout better than with the Mastodon app.
I also tried Twidere but wasn’t able to display my own thread properly with that, and also it crashed twice.
I was attracted by the feature to post simultaneously to Mastodon and Twitter with Twidere though - are there any better iPhone apps out there able to do this?
@rahmstorf Ich habe da keine tolle Lösung parat, empfehle aber @paul zu folgen. Er ist einer der Macher von der App Tweetbot, meiner Meinung nach die beste App für Twitter unter iOS. Und er arbeitet offensichtlich an einem Client für Mastodon.