I don't think tanking needs to be made any easier, I do think the one thing that doesn't get stressed enough through tank story quests is the importance of your gear being up to date.

The only one I've seen to 70 is WAR (my bf mains it) but I doubt either other tank job stresses it much more. The problem would still persist though - bad tanks that don't read their tooltips are likely also bad tanks that don't read their tutorial pop ups.

I just think calling for a nerf to "tank difficulty" is too broad. There are probably more good tanks out their than good healers and certainly more than good DPS if we define each role by their primary objective. To make the entire role easier to perform would just push more skiled players off of it which I doubt anyone wants.