I dont think the slash res is much of a issue,
Piercing is a bit centralizing but either give that to bard and MCH or they do flat damage and get a slight buff to make up for the loss,
Blunt is just there unless they add another blunt weapon really minor thing.
Now i think of it these would make good role skills,i dont think these res downs should go though

I believe war just needs to be toned down not necessarily nerfed
Other 2 tanks just needs some QoL (and we all know who needs some aoe),
I don't see much of a reason to remove SiO or Divine veil unless its to cut back on the healers ogcd meta??