It's just hard to imagine that in this world people have not thought to combine skill usage OR organize balanced parties around specific roles. What, did they used to have parties with dumb/random compositions like:
- all support, no tank, no DPS
- all tanks, no support, no DPS
- all DPS, no support, no tank
- 3 tanks, 1 DPS
- 3 support, 1 tank
So Selma apparently came up with the unprecedented, balanced holy trinity of having 1 tank, 1 support, and 1 DPS minimum in a party, which is basically just the standard RPG tank & spank meta composition in just nearly every game out there...