First, there is the issue of what players have come to call “off tanks”. The biggest issues center around D.Va, Zarya and Roadhog. The current playstyle of those tanks (if you’re adhering to various metas that have existed) is to pair them with other “main tanks”. Obviously, if we were to change the distribution of roles from 2-2-2 to 3-2-1 it would require some balance changes.