Power Attack is a low-level bleed and Power Attack Bleed is nothing more than SSG directly connecting the damage to the gambit.

Every plugin author knows that SSG could change things at any time. It is now up to the plugin author to change their plugin to conform with this change.

Agreed, SSG should have mentioned this. SSG does not have to revert this change, it is the plugin that needs to be changed.

This change also follows the programming principle of self-documenting, now you'll more easily know which gambit is doing what.