I once attended a workshop by a guy who had been a salesperson for Piano I, Piano II etc books. He noted that sales of those fell off geometrically for each successive book. So he basically advocated/hawked an improv and "fakebook first" approach, as a means to make enjoyment [potentially] primary.

I had an interesting night some years ago interacting with a Google piano ML available online. It would broadly mirror your input is a sort of call and response way. Even with only a qwerty keyboard (i.e. home row) and really elementary melody/stacatto it was remarkably pleasing. Relatedly, This could be one reason I anticipate great potential with GPT-like tutors.