Your 1 reminds me of shifting leading hands on an instrument. Revisiting from scratch, crippled, is really an illumination. So much was possible without explicit understanding.

2 :)

3 Didn't learning new finger patterns also rewire the way you "handle" position and movement too ?

ps: about switching layouts, I realized that my brain associates layouts to certain machines. Typing in Qwerty on my laptop is easy, in Azerty on my parents machine is easy, but not the other way around. Doesn't help that they're both so close to each other I guess.