Shake it Off and Divine Veil have been at least comparable if not better against magic damage than Dark Missionary / Heart of Light for quite a while, so DM / HoL didn't have any unique strengths nor have they lost any, they only had and still have unique weakness. Also how are we talking about things being unique where Dark Missionary and Heart of Light were both added in the same expansion and since their conception they have been literally the same ability with a different icon and name.

I'd rather have jobs be differentiated by their gameplay than some weird checklist of "strengths and weaknesses". The fact that I've the same or equivalent mits on all tanks I play bound to the exact same buttons, and how I play those tanks in the same content is more or less identical sans the dps rotation is why tanks are homogenized. The fact that some of these buttons on different tanks are way stronger than they are on other tanks provides very little actual gameplay difference to me. All it gives is frustration with the game not being balanced when I do content and I press my buttons and someone dies and I know if I played another tank and pressed literally the same button on my mouse or keyboard they wouldn't have.