Speaking personally, JVM toolchain bits like Gradle being involved is a turnoff and has kept me away from KMP. Last I checked support wasn't really there yet, but I'd much rather go the other direction and use Swift Package Manager and the associated toolchain on Android.

I work on an open source app that uses a shared swift core for the iOS and android apps and I think it's awesome. I think having all your business logic in swift is great.

At work, we use react native, and although the upgrades and stuff are painful, I'd never give up the ability to ship over the air updates.