To the OP, it seems that you're voluntarily ignoring what is being said by GZ. Marauders and Snipers are becoming increasingly popular for their crazy damage output, concealment Operatives have already been very popular. All of these classes have a metric ton of white damage which if a tank stacks defensive stats, armor and a shield is dramatically mitigated.
Tank can mitigate the highest damage classes if they chose, along with having a lot of utility and when paired with a healer be one of the most difficult class combos to kill. What is the problem?