React Native and Flutter are way more popular than KMM/CM, and yet both have struggled to support even small iOS visual changes in a timely fashion.

This is ignoring the fact that developers who choose these cross-platform frameworks don't seem to care much about quality and general polish.

Apple will gain more from their own existing ecosystems, all five of them most developers within the Apple ecosystems if they pretty much followed all the rules most of their software will work on day one with very minimum changes, in short, they will be 90% of the way there.

It is a thing to some extent, but there’s also a correlation of companies that do cross-platform for simple apps being cheap on development, and making it work very well on some specific platform isn’t their priority.