I kinda dig the idea, but I think it would be better to be more generalized rather than very specific.
Like, some I think it’s important for racial identity, I think the Blue Light common to Elune is long overdue for Priests, but other classes, like Warlocks, I think they would benefit from having other class fantasies baked in, imagine something like a Necromancer for demonology.
Other classes are a bit harder, I can’t think of anything that would particularly change the mage’s class fantasy, save for maybe lightning magic for Arcane? Mages have this weird connection to lightning where in theory it’s something they can do, but it never was represented in the lore past WC2 save for a few spells having lightning around them like Arcane Power.