I'm happy the delay is gone (I didn't notice anything about the lower octave delay, but perhaps I just can't tell). Forcing octave modifiers is super uncomfortable though. They should display all three octaves at once, or allow separate key bindings for each note, but let the UI still show only the one octave.

I was excited for a new UI, and knew that my old key bindings for songs I have memorized might need to be shifted around. I was even willing to try out the new UI entirely, but having to press shift, control, or alt all the time makes even easy music a slog.

You also have to be completely stationary while playing. Before, you could have notes in your hotbars and begin playing away at any time while having other menus open or when following a friend around.