While I could see the axe/shield argument for the usual reasons.. I feel like it'd be opening up a whole mess of worms giving another job a shield at this point. For two reasons:

For one, any "cool" shield design BST gets will immediately cause PLDs to declare that they should also get that shield design, and vice versa. Going to run into the issue of wanting to keep things separate and unique without overlapping, but inevitably, one job will essentially be stealing designs from the other.

Two, I feel like it just reopens the 1h+shield mage debate. While nobody's actually using that combo in any real content (except maybe Bozja), it's still at the least a valid glamour option.. kinda? Idk, in my head there was a stronger point here somewhere before I started typing..

Point is, for better or worse, I suspect shields may only always and forever belong to PLD and nothing else.

But, that's my personal speculation.