The Final Reason on why we have more DPS than Tanks or Healers

[Voltyblast]

Heh the reason is simpler than that: people like to dps more than healing or tanking. Do you see people in other games "running" to the tank or healer spot? Do you see more tanks or support being added in these games (not just ffxiv)? Of course not.

If people were more prone to play tanks or healers, I would be able to play assaults or defense in Overwatch, or assassins in Mobas or - in this game - I would be able to get into any team without waiting half an hour of queue!

This also leads to why a lot of DPS "suck" at their classes in many games, because they don't even know how to play them: they just like it because "it's a <insert class here> and I like <Insert silly reason>".
I don't like BLM but I like big numbers (and I'm fairly good at giving those big numbers), and I like tanking because I like to be required and I like insta-queues (especially when I'm a solo player who doesn't rely on others)

PS: This is my opinion so torches and forks aren't required.