Make all Tank AOE Combos Cones Please

[Seraphor]

As such, there's only one real difference between conal AoEs and radial AoEs: Radial AoEs sacrifice 3 yalms range and ~48 square yalms (at a 150-degree cone) area in FRONT of you to be able to also hit BEHIND you.

That can only be positive if you have enemies behind you... which is entirely within your ability to prevent. You're spending all that on the assumption you'd otherwise fail an exceedingly easy task.

It's also entirely within your ability to ensure, by positioning yourself in the centre of the pack. It's not difficult.
Enemies typically cluster in a circle, not a triangle.
I have never, not once, had an issue hitting every mob in a pull with a radial AoE, other than the obvious ranged enemies who you need to kite around a corner, but that's true for cones as well. This argument assumes that PLD, DRK and GNB have all been failing to tank for the entire time they've been in the game.