I came back to say exactly this. After having thought about it I realized that the Arcane Curio Cabinet is huge.
The biggest issue I see is the material cost. The curio cabinet is similar in raw materials needed but not exactly the same to 2 large chests, and its materials are less processed. There should be a direct proportional correlation in number of slots and materials. Of course in the case of the cabinet the slots are single purpose.
I like the idea of novel items in the battle pass but I can see in a PVP game where it could be an annoyance.
The Apothecary chest having fewer slots literally cost them a sale of the Bazaar item with me. So that’s not the solution. I’m not sure I like the idea of everything being “illusions” either, it’s nicer to get things within the same recipe/knowledge system as the other items in the game.