There's more workings than just straight up damage for that to happen though, such as the utility they bring (damage down and a reliable silence which was needed in eariler encounters), or what the fights throw out (unavoidable damge at melee range, such as garuda's wicked wheel). Otherwise this principle could be applied to any job that has top dps for now. The reason people aren't stacking X jobs is because everyone now brings something to the table aside from just dps.
