Google's keyboard is okay for English. It's a complete tire fire for two other languages I use (both popular and with a very large training data set).

Suggests words that make no sense, preferring rare words to much more widely used and obvious matching picks. Has the vocabulary of a poorly educated five year old idiot savant — fails to complete many words you use fifty times a day, but sometimes surprises you by suggesting something you'd hear a couple times per decade. Doesn't know other forms of the same word, forcing you to correct it manually over and over again, often failing to remember the word until you type it in four or five times.

Yes, I've downloaded all the dictionaries, tried it on many phones, and my friends are of the same opinion: it really is just bad.

Never used the Windows Phone keyboard but after Swype fixed its worst error ("me" was very often rendered as "nee", as in the term for a maiden name) it was fantastic. The last time I was able to use it was ca. 2016 when my Nexus 6P suffered the dreaded battery-goes-to-worthless-one-night-and-never-recovers problem. The editing keyboard allowing precise cursor placement, the Swype-X/C/V shortcuts, Swyping above the keyboard to indicate capitalization - WHY WHY WHY were they dropped?

The swiping keyboard from Apple simply refuses to do "and" for me. I get "abs" (I'm not a gym rat; I don't talk about that) or "Abbas" (the only one I know is the Palestinian president, and I don't talk about him either) almost every time. I hate the autocorrect-something-five-words-back problem, but not being able to recognize one of the most common words in the language is unacceptable crap.

I'll give Swiftkey another try.