I can't tell about windows - never used autocorrect there - but GBoard became laughable. I don't think I was able to use its suggestions since a few years. For instance, it will NEVER but really never put a uppercase I when I'm talking about myself. Never. I could select it from suggestions if I feel like, but I kinda gave up (this is written in Windows, that's why you see capital Is). Or my name, used quite often right, is also never spelled correctly - although it's there in the suggestions. I am using a yahoo email, GBoard knows the username, but it will ALWAYS suggest a gmail extension, which simply doesn't exist. I don't know any other keyboard which can properly handle multiple languages, so I'm stuck with GBoard, but it's nothing to be proud of.

I have the same email @yahoo.com and @gmail.com (one is mostly for online shops etc), and the amount of time GBoard thinks it needs to recommend @gmail.com, it's obnoxious...

But the correction offers are still okay for me, I can mash keys around my email username and one of the corrections offered will be my username...