I agree that simplicity is extremely important. Additionally, I wanted to remove the need for build investment in order to avoid X class/build from being pressured to make "Fix Death" solution. Assigning Life to PP instead of Earth 9 just means someone else is going to get the pressure.
The nature of the pressure is a little different, though.
As a healer on the battlefield, prioritizing limited healing resources when there's not enough to go around is one thing.
As a potion maker trying to make some cash at the market, if you'd like to form a line around the corner to give me coin and a reagent I'm happy to profit/help. And batches are a thing, so I'm never really "out" of PP if the demand is high enough.
But you could also decouple it from PP since reagents are going into it. Denver's LCO crafting doesn't consume PP either.