Revisiting the physick question

[Remedi]

Hmm the MP pool hasn't really changed that much for SMN though. Yes Ruin III is no longer an MP dump but even back then effective SMNs could DPS and rez without being picked punished too much because they had Aetherflow and Energy Drain as additional MP recovery. These days even Lucid Dreaming isn't always necessary, same goes with SCH, they both can have very effective MP management in the right hands.

SCH had recent unintended effects from summon spells?

The change to summon spells made dissipation much stronger than it was.
The problem is that while they don't have much spells in common anymore, some of those spells still bog them down from a design decision that is no longer supported as such It would be better to remove it altogether

[Kurando]

snip

Dissipation is more useless in SB than it was in HW and finds really niche usage at all, and that's not because it's "much stronger than it was" but it has more cons than pros.
Not sure how the shared actions bog down either of the SMN or SCH in all honesty. Lore wise they both have the same beginnings and won't change, even if the jobs seperate they will still share certain actions. Although this type of system won't ever be repeated by SE, they have finally balanced them out now and no point in trying to fix something that isn't broken.