I feel the same way about Android's. It just seems like spell check used to be so much better then years ago. But I'm not sure whether it's comparing mobile with desktop expectations. It really seems extremely dumb on Android.

When I used Windows Phone 8.1 I felt like I was typing text twice as fast as on Android. Better suggestions, more accurate keyboard inputs on the same screen size, and selecting an entire word was just a single tap which made fixing a typo very quick as well. Meanwhile back then it was impossible to make certain text selections without a bluetooth keyboard because of how Android constantly tried "fixing" touch-based selections. It's sad that Microsoft shut down the only system & UI that felt like the developers were actually thinking of the user when designing it. To this day no other mobile OS is as friendly to left-handed users.