I was using Thunderbird on Android for years and keep using it on Linux, but it aged rather poorly.

Search is completely useless, it never-ever finds anything. Threads are supported, but their functionality is not configurable so whenever I lazily click on the complete thread (instead of opening it, scrolling down to the last item and clicking on it directly) it opens every message of the thread. Really nice functionality for large threads with 60+ emails!

So I am a bit skeptical why on earth they would increase their coverage when the already supported platforms lack decent UX.

apparently that is a native iOS application, I wonder whether they tried to use KMP to use same codebase with the android app