I think here is where we finally agree on something, as in an earlier post in this thread I mentioned that over 50% of the tanks I have grouped do not know how to mitigate properly and eat up my resources very quickly. On the other side of that coin are the tanks that are nigh unkillable. DPS players are likewise in that they can quickly eat up healer resources as well if they can't stay out of the bad.
Unfortunately, this actually serves for the devs to keep things as they are as the lowest common denominator can and likely will dictate the direction they move in. It's a juxtaposition. Force difficulty on the casual playerbase, and many of them will just bail, but those who stay will get better at the game. However, I believe that the pendulum has swung too far in one direction as this point. If things don't change in 7.0, then SE is going to start losing players from the skilled side of the playerbase. The game is simply far too saturated with content that poses little to no threat level at the normal difficulty. And while there are more difficult duties to participate in, the problem with this is that players of all skill levels are incentivized to participate in NM duties via MSQ progression and roulettes.