I've been using florisboard for a few months now. You will have typos. Auto-correct for obvious things would be nice... once you install a dictionary its not awful, but the dictionary struggles with simple typos since it isnt usually taking rhe surrounding words into context of the misspelled word. I think the only dictionary i could get installed was from libreoffice? So could just be a lack of common mobile typos in the dataset.

Florisboard does support things i actually used from gboard like a function row up top with undo/redo, activating voice options, and a clipboard with history. It also supports things like apps that support the autofill hints similarly to how itd pop up on gboard. Of all the foss options, it was the only one that had these modern expectations, so i also think its the best bet for a gboard alternative people will actually switch to. Anysoft and openboard are way too minimal (not a bad thing, just not what an avid gboard user is looking for)

Swipe on floris is ok. It definitely triggers when you don't want it on occasion. And the lack of autocorrect makes recovery miserable.

I tried openboard too, but i could not get openboard to a reasonable size on the screen. Pixel 7 pro is fairly big... and i use the smallest text scaling... but even the smallest layout options put the top row out of reach of my thumbs.