There are many apps for iOS.

Damus is 100% being worked on.

I use a handful of apps between iOS and web but Damus is my daily driver.

For the rest of them, just because I’m not using them, or you aren’t, doesn’t mean that devs aren’t doing a lot of work everyday to build them.

It takes time to build something great. A lot of people have no patience for it. Although they may not know what goes into building so maybe that is just to be expected.