Why can't we have jobs with this level of depth and customization in FFXIV?

[Magis]

My opinion is that the solution to this would be putting all elemental spells back where they were originaly and give THM another job, like WHM (and give them their cone AoE back). They are priests after all and were the best healers while the CNJ were the ones who played with elements.

Even in the discussions which classes get WHM or BLM before the infos about it got announced, I was in the "give THM the WHM job" group.

Always found it weird that the CNJs couldn't take advantage of fire, thunder and ice yet they are the "elementalists" of the game's lore.

We can't have it due to poor implementation and design by developers, fear that players are too dumb to understand or capable enough to utilize, and probably some story reason as a cop out.
snip
-THEY HAVE TERRIBLE CODE AND CANNOT FIX THIS AGGRO BS THAT HAS BEEN IN THE GAME SINCE RELEASE. HOW HARD IS IT FOR ENEMIES TO CANCEL THEIR IMMEDIATE ACTION, STOP CROSSING AN ENTIRE FIELD, AND GO TO A DAMNED TANK AND BEGIN THEIR ATTACKS AS SOON AS THE TARGET IS CHANGED? WHY IS THIS STILL AN ISSUE A YEAR LATER?

I agree with your points. However the last part... is that why in T7 the Lamias run to the middle of the fight when they spawn, instead of going to the tank?