Indeed, "cross-platform UI" can only be as good as the average between all the platforms it supports and it usually ends up costing a lot more than using the native UI kits of each platform. Kotlin Multiplatform has been and continues to be the "happy path" for buildings apps in our studio - native UI + shared business layer. Also, in terms of API stability and mental load, Kotlin is a lot more productive than Swift... and it doesn't come with a yearly breaking cycle.