Hi!
Quick poll here: Do you use Cmd or Ctrl + Y for redoing? Yes or no?
I mostly use Cmd + Shift + Z, and because Cmd + Y coincides with the history shortcut on Chrome, I end up redoing actions and running into problems because of that.
My vote would be to keeping the Redo shortcut only on Cmd + Shift + Z, but maybe there’s a ton of people using Cmd/Ctrl + Y out there… thanks!