I misread the patch notes... I thought they were unifying all the Cyrodiil repair kits alongside making siege stackable. Turns out it's just gear repair kits of different levels.

But please do this, ZOS! Unify the door repair kits, wall repair kits, siege repair kits into alliance war repair kits that can repair siege, walls and doors. (And bridges/ milegates too, I can't remember offhand if they have separate repair kits too.) It would be a significant win for convenience and being able to fit all the necessary things onto the quickslot wheel, plus would help with inventory management.