On the one hand, cool it's neat in a vacuum that one role (or in this case 1ish job out of that role due to self-sustain) can do something ridiculous when soloing if played really skillfully.

On the other....what exactly can the other roles do by themselves again? Oh, be bored? What a thrilling unique capability. The fact that tanks have WAY more defense than the other two roles while having damage output that's near a DPS and single-target healing that covers the pathetic outgoing damage this game tosses at you means tanks are just OP.