For all features missing, like some libs maybe would like to have, youre always able to code it yourself with cocoapods and Kotlin multiplatform expect/actual.
Every single case I so far have been able to code with Compose + Kotlin in a nice way. Mostly decoupled with Koin DI framework.
Can do your own input field with BasicTextField as of example if not like Material 3 one, or the iOS variant.
What I feel lacking is build and gradle plugin support for Swift and decouple all crap from XCode dont want to spend time with. Like basic setup of xcode config files in IntelliJ or Fleet to work out of the box.