Tank Stances and WHY???

[Seraphor]

Because when your level gets synced down, all your buff abilities get deactivated - which happens to include your tank stance.
Probably easier to do it that way than having the game figure out which should be shut off, and which should have their effects reduced, and which would be fine to keep activated.

BLU is able to enter duties and maintain Aetherial Mimicry. So I see mo reason why they can't program the same function for just four other abilities.

[aodhan_ofinnegain]

BLU is able to enter duties and maintain Aetherial Mimicry. So I see mo reason why they can't program the same function for just four other abilities.

This was pretty much answered on the last page.

Because all BLU actions are level 1, they don't have restrictions like all the other jobs. Once you obtain a BLU spell it's available regardless of sync (obviously you need to set it first).