It's no secret that fair few classes suffer from PP issues, some more than others. They should just keep PP as 100 (adding a % to it rather than it showing as 100 / 100) and just have passives for specific classes that reduce PP consumption instead. (Class boosts that previously added PP would instead reduce PP cost by 0.5-1%. Or increase PP Regen by 1% every second. This would be additive, meaning if you have 0 PP Regen, it would increase to 1% Regen rather than it taking 1% of 0.)
This is technically what FFXIV did with MP actually. They changed all of their jobs/classes to have 10000 MP (and on the party dialogue the MP shows as 100oo. Like a Percentage.) The developers of FFXIV stated that MP always was a percentage of cost as it was, even with the old MP amounts. So they just consolidated it for ease of balance/etc. Nothing increases MP maximum anymore, and the healer PIE stat now increases MP Regen instead.
it would help players a lot to have this streamlined so they can enjoy each class more than ever.