Yeah long ago when I was doing some iOS development, I can remember Apple UX responsives mantras like “don’t block the main thread”, as it’s the thing responsible for making app UIs snappy even when something is happening.

Nowadays seems like half of Apple’s own software blocks on their main thread, like you said things like keyboard lock up for no reason. God forbid you try to paste too much text into a Note - the paste will crawl to a halt. Or, on my M4 max MacBook, 128GB ram, 8tb ssd, Photos library all originals saved locally - I try to cmd-R to rotate an image - the rotation of a fully local image can sometimes take >10 seconds while showing a blocking UI “Rotating Image…”, it’s insane how low the bar has dropped for Apple software.