To be fair, it's tank buffs like convalescence that need to be changed to allow abilities to heal more like the new Asylum, not Largesse, because Asylum is a "healing recieved" buff. Largesse was fine in so much as it was a WHM ability for a class that had a lot of healing spells, and while AST could also make great use of it given their plethora of "spells", it wasn't anything SCHs ever really wanted in the first place since they already had it with both Fey Illumination and, if they were silly, Dissipation. And of course, one of the balances for a heavy ability set was that abilities weren't buffable, which was just another pro and con. As it was, largesse was still useful for beefing spread-adlo and for damage spam phases like Omega's final mode, but honestly they may as well have left it with WHM instead of stripping it for a filler role action.