[AgentME]

I spend a lot of time hiding whole comment subtrees when browsing Reddit threads, especially on mobile. I'd do that on HN too except HN's UI is completely mobile-hostile with how tiny its buttons are. I don't fault Twitter for picking the opposite default.

In small discussions where most people are interested in every detail being followed up on, HN and Reddit's style is nicer. In popular discussions where every individual message has too many replies to care about and most people don't care to see every single subthread to completion, Twitter's style is much nicer because you can just scroll without repeatedly hitting buttons to avoid getting caught in way too deep subthreads every single message.

[boardwaalk]

Some reddit clients have a "next top-level comment" floating button. Apollo does at least, and I thought the official client did too.

[saagarjha]

Hacker News has these as parent/prev/next buttons.