If you're unhappy with this game then unsub... forever.

[Koros]

It is true that statistically people gravitate to the simple jobs and SE almost certainly will notice this. If they notice this, it's only a matter of time before the question is raised "should we make all jobs simple?" and here we are.

No, people gravitate to meta jobs. WAR, DNC, and SMN are all meta for casual prog because of WAR's Holmgang for PF invuln strats, SMN for raise and the high mobility, and DNC+SAM is one of the easiest way to boost your rDPS. DRK is actually the most played tank in JP, along with SAM being the most played DPS. A lot of people don't actually like playing DRK though. These statistics don't show anything other than what's meta.

Nerf WAR's self-sustain and you'll see WAR becoming far less popular.

Also, a lot of people gravitate to jobs because of the visuals. How do you disentangle the % of players picking up a job because of the visuals vs. them picking it up because of the simplicity? A lot of players play DNC, WHM, and SMN purely because of the class fantasy, not because of the mechanics.