Even potency based would end up getting affected by stats like spell/skillspeed, especially jobs like MCH who live or die on their skillspeed, but I get the gist of what you're saying.

I won't argue that SSS is useful beyond that. It's just my anecdote that learning those 3 minutes, looking at as many variable scenarios and gauging every single visual stimulus I could to create shorthands for myself in a solo environment I can reset at will, I wouldn't have been able to adapt MCH to savage nearly as quickly as I did.