this is probably something you would find condescending if you were insecure about, the way he said it was not condescending at all- especially when you consider his sentence immediately after pointed you towards information to help improve at it As for the groove, the difference between that random dial and what he did is it is done with intention the way someone would actually play a chord, with fingers hitting each note in sequence (usually down the scale, up on the piano roll as he did). However, I do agree this is a waste of time in most scenarios unless your aim is to create a natural piano centric piece, as he was. Once you accept you can learn without hurting your ego you will make leaps and strides in progress, and if me saying this bothers you you likely still aren’t at that point