Yeah, I have switched back, unfortunately; had high hopes but maybe in 6 months. Issues I had:
- Changing of the word already typed, as just mentioned; I just don't understand it and it is frustrating
- I am annoyed that I can't even swipe something as innocent as 'crap'
- I just miss a button for punctuation; the insistence that I have to tap on the button to switch the keyboard (essentially) just to type a question mark is really annoying me
So I switched back to GBoard. I tried SwiftKey again but it's inability to delete the last swiped word without the long press drove me nuts.
BTW - you do not need to be worried about 3rd party keyboards sending stuff anywhere if you do not allow Full access rights to the keyboard. I know both GBoard and SwiftKey do tell you to do it, and you need to do it, but then you can disable it for both and keyboards will still work. Full access is what gives the keyboard access to the networking stack. I would definitely not use GBoard if it did not run without.