I used to use Colemak on Android before I switched to iOS. As nice as layout parity was in principle, it was noticeably unfit for swipe typing. Too many words just ping-ponged along the home row.
I used Dvorak on Android, before switching to iOS. Same problem, of course. It was nearly unusable with swipe (my now preferred input). It made me realize how badly a swipe optimized keyboard is needed.