The faster the playing speed, the harder it is for me to hear if I am all synced up. Another great example is moonlight sonata third movement, the very first parts where the left hand is just hopping between two notes while the right hand is arpeggio-ing away up the runway. The faster I play, the more impossible does it seem to me to hear if I am playing it correctly.
I also am profoundly unsurprised by the epiphany that it - here being all things - can be achieved with, quote-unquote, maximum practice. Thanks j_tour for that, it somehow makes me laugh and cry all at once.