Like Potionseler said, this is actually similar to how the first iteration of this hotfix functioned on Beta/PTR a couple weeks ago. Since then, it has been adjusted to match 2.4.3 behavior. Getting partial energy ticks/an energy refund on shift would help and be a much appreciated improvement but it is not quite the same as how powershifting works in the Classic Era. edit: Not quite the same as how powershifting works in the Classic Era, or how it worked for HALF of TBC up until 2.2.