The point of this change is this, healer/mages are awesome, and this change wouldn't remove them. There are already existing mage builds with both high psyche and int. But in general, healing should be more separated from magical damage. They should not be the same role.
Where this becomes particularly important is in builds that just want the healing and not the offense. For instance, most good hybrid builds are going to have both some int and some psyche because they want the spell effect, total mana pool, and magic resist. This change wouldn't really nerf them BUT, suppose you have a paladin who purely wants heals and tankiness. They could min int and put the rest in psy, making their build stronger in exchange for losing offensive spells.
Other side effects:
Psy stack builds are currently stupid. Who the hell would take 80yo over 60ish even on a fatmage? Nobody. Extra magic resist is a top tier stat for 0 builds. This also adversely effects races like Sarducaans and Sheevra that have great Psyche maxes.
I want you to take a look at this build and imagine that as I suggest, their healing power comes from Psyche:
Nothing special right? Pretty bad build TBH. Not very fast or super strong for a melee build. But imagine that 106 Psyche isn't just magic resist. It's also the stat that determines heal strength. All of a sudden that is looking like a pretty badass healer hybrid (assuming next patch's int curve makes 106 a good caster stat level again). It's not too slow, not too weak, not too low HP total, and it's highly magic resistant and capable of quite solid heals to make up for it. Sarducaans just became useful as melees. And it didn't steal any other build's roles to do so. It's good at the new role this would create. Heal-heavy hybrid.
Where this becomes particularly important is in builds that just want the healing and not the offense. For instance, most good hybrid builds are going to have both some int and some psyche because they want the spell effect, total mana pool, and magic resist. This change wouldn't really nerf them BUT, suppose you have a paladin who purely wants heals and tankiness. They could min int and put the rest in psy, making their build stronger in exchange for losing offensive spells.
Other side effects:
Psy stack builds are currently stupid. Who the hell would take 80yo over 60ish even on a fatmage? Nobody. Extra magic resist is a top tier stat for 0 builds. This also adversely effects races like Sarducaans and Sheevra that have great Psyche maxes.
I want you to take a look at this build and imagine that as I suggest, their healing power comes from Psyche:
Nothing special right? Pretty bad build TBH. Not very fast or super strong for a melee build. But imagine that 106 Psyche isn't just magic resist. It's also the stat that determines heal strength. All of a sudden that is looking like a pretty badass healer hybrid (assuming next patch's int curve makes 106 a good caster stat level again). It's not too slow, not too weak, not too low HP total, and it's highly magic resistant and capable of quite solid heals to make up for it. Sarducaans just became useful as melees. And it didn't steal any other build's roles to do so. It's good at the new role this would create. Heal-heavy hybrid.