Mysto I understand your point and agree with it.
However, in this case Adoramus is cast automatically when using Arbitrium even when there are no gems in the inventory. Therefore, it doesn't make sense for the gems to be consumed when there are gems in the inventory.
Also, It's forces an item to be used, while using a skill that is substantially weaker and does no damage in comparison, while consuming something you would rather keep for more important useful things, like ancilla.
I would like to emphasize that I suggested nullifying blue gem consumption ONLY and SPECIFICALLY when Adoramus is cast automatically when using Arbitrium with the Dimensions set. In all other cases, gem consumption will continue as normal.