For christ sake, you really see no difference between a job that outputs 99% of its max output when played while ignoring all positionnal, and another that outputs 75% in the same situation ?

When it matters, people make mistakes, because shit happens. In that situation drg will just lose MUCH less than nin or mnk will. This is NOT balanced. You can not balance everything assuming no one makes any mistake and call it a day. I'm glad for the drg buff for their ceiling. But making their floor at 99% of the ceiling is not good balance, period.