1 tanks is really all we need. The power of 1 tank is far more powerful than a single DPS or support. WHich is why we only needed 1 of them. It has been in question if a tank is worth exactly 2 of DPS or support though since OW1.
A single Ana can bring a roadhog to his knees. A single bastion can keep a winston in check. There are outliers in this.
That’s kind of been the issue is that tanks haven’t always felt exactly like worth 2 DPS or 2 support. I’d say maybe more like 1.5x a DPS or Support.