There's aspects of Flutter I don't like, but the cross-platform seems to strike a fairly compelling middle ground vs. what you've probably had experience with.

There's aspects of Flutter I don't like, but the cross-platform seems to strike a fairly compelling middle ground vs. what you've probably had experience with. It's almost like the C approach. There's the common stuff abstracted that's not particularly platform-specific (here's how you draw a red box, here's how you load a jpeg, etc...), and then all the really platform-specific things, like theming, is handled by just a handful of basically #ifdefs So much so that you literally have platform-specific widget implementations to go along with the platform-specific themes. Which sounds worse than it is, but defining new widgets is super easy. Not a write-once-run-everywhere but more like a write-1.2x-to-support-2-platforms type of thing. It risks being uncanny-valley at times, and implementation can drift from platform needing re-alignment, but it should let you do those really platform-specific stuff in sane enough ways.