What if in a world where upon entering a dungeon or raid, all of the Tank classes ability to do numerical Damage was completely removed and replaced with plain threat. The numbers you see when you activate a damaging weaponskill instead was aggro numbers generated.

What if STR meant nothing and VIT instead helped scaled your aggro generation much akin to how STR scales your damage.

Naturally skills and gear would be redesigned to this new idea but the question is; Would you play a tank design like this?

In a world where Tanks can only generate aggro and mitigate hits, healers can only heal and cast debuffs or whatever it is they do, and DPS were the focus of all damage on party to boss.

Would this be fine?