I agree these are important aspects for fast accurate typing. Although one time I did see an Apple store worker typing crazy fast (and accurate as far as I could tell) on an iPad onscreen keyboard, on par with my physical keyboard typing, but I think that’s the exception. The learning curve is too steep for most. Plus no matter how good you get, there are other disadvantages to virtual keyboards. For tablets, it takes up half the screen, and it’s non-ideal ergonomically to type on and look at the same screen. And for all virtual keyboards, you pretty much have to look at it while typing, which makes it inefficient to do things like transcribe or take notes on visual observation, and you aren’t able to observe your typing field to correct mistakes as you make them. You could get away with looking at the virtual keyboard with peripheral vision in some cases, but error rate will increase compared to a physical keyboard.*
Voice dictation is another option but is not for all speakers, is limited to when you’re alone, and you lose granular control like unique spelling.
So until there’s some radical text input innovation, physical keyboards will forever be the go-to for serious text entry, no matter what device people are using, now or in the future.