Mitigation as a paradigm is very messed up by SCH (almost to the same degree DPS is messed up by PCT)
Compared to any other class (even SGE) SCH is basically 2 jobs worth of Mitigative potential all by itself
Upping mitigation requirements even further further benefits SCH (who already has like 6* the clear rate of SGE) but as it stands right now you can break mitigation plans with a SCH alone. The class is kinda bonkers