I wouldn’t say you are entirely correct about Arcanes need to be universal because we had arcane trickery before universal source of finisher was available, also energize have no purpose on Lavos and hildryn, as well as barrier and aegis not being useful on kullervo, inaros, and Nidus.
Yeah I beefed them up as well, as I got to level cap with exalted blade but energy becomes a huge problem with eximus not being affected by cc so you constantly have to waste energy to keep shield gating up especially with the higher constant spawn rate of them the longer you stay. In certain mission it is better to leave them inactive until a priority target but most regular weapons can deal with it as easily or better but don’t have to go through the constant casting animation. It might be the type of content I play that is why I have some bad views on them but disregarding that, exalted weapons are objectively worse than some regular weapons.