Correct, you explained it better than I could.
What the devs formally endorse and how the game substantially plays are two different things. But even if we consider party composition, it makes the most sense to have 2 ranged and 2 melee dps. The number of available jobs (and the way they're balanced) should reflect that. And right now, we have 6 ranged dps and 4 (soon to be 5) melee dps.
