Nah, it's justifiable since they weren't supposed to be immune in the first place. Would tend to agree though that for non-casters, the inherent capabilities could use a utility boost given the lack of uniqueness, and that the latest set of mobs directly is nastier vs them than anything else. Say, a fortification enhancement line (no, the immunity to healing feat doesn't count), or changing those feats/aps that throw in dr +1/adamantine to a percentage (or just have docents offer dr based on enhancement that stacks, but honestly that's more caster-freindly than anything else, and that's most assuredly not where the race is suffering right now.).