I’ve used Florisboard on my device for a few years now, and completely shocked at how barebones the stock Android and Samsung keyboards are…
It can undo, redo, cut, paste, select all, view/insert clipboard history, clear clipboard, and swipe to move the cursor within text. Standard stuff like voice input and swipe typing are here too.
Admittedly it’s not perfect, and probably not ideal for most casual users in its current state, but I just can’t go back to a standard keyboard after using this feature rich one for so long