I wonder if they were trying to fix the oracle and voidray micro trick which if performed correctly would increase the damage. If performed incorrectly it could actually reduce damage or stop the attack. (This trick was basically a-moving and then right clicking on a specific unit or structure at a specific beat pattern with the goal of increasing damage output.) I think little tricks like this which increase the skill gap is a fun and innovative part of the game, similar to many aspects of Brood War play. This feels similar to when they changed the phoenix to attack while moving based on their interpretation of the community feedback and they totally dropped the ball on that one.
Late game PvZ is already looking pretty grim after the carrier nerf and if the oracles cannot properly defend a third, it seems P is going to revert to the days of 2-base all-ins as a standard PvZ game, which makes for an uninteresting e-sport to spectate and even less fun to play.
I would like to hear the thoughts of experienced players on this topic though.