I hate the fact that unlike our account banks where we have a collected more of a material we can just drag the stack from our inventory to the stack in the account bank and it automatically merged both stacks into one; but with guild banks we cannot merge them, we have to stick them into another bank slot and then get someone with withdrawal permission to remove both stacks merge them in their inventory then deposit them back into the guild bank.
This is a huge waste of time when you have a lot of items and mats in your guild bank. Just like making superior siege, it’s an awful lot of time wasted for so little.