I mean true.

That said, I'd say the bare minimum is expanding the offensive library though. SGE's ability to heal is fine. It's not lacking in healing or mitigation. It's lacking in offense both in the fact that it needs gameplay like all the others and also that it fails to offer enough damage value in contrast to AST and SCH despite having no utility beyond the mitigation that SCH specifically also has. In terms of balance, it basically boils down to do you want SCH with better damage and expedient or SCH with worse damage and no expedient?