Seconding this. The big issue between people who want more space and people who think it's not needed I think is how much glamour gear you keep around.
I've been collection glamour gear for years now, from raid gear to relics to artifact gear to particularly nice dungeon gear like Bonewicca and Shadowless, to just hard to get crafted glam and everything the Gold Saucer has to offer.
I have six retainers completely full on glamour, stuffed to the brim, and a seventh well on the way. My Glamour Dresser has around 3 slots left. My saddlebags are full. If we don't get more space I will soon have to go through all of it and determine everything that can be re-acquired with relative ease because I am just running out of room.
If we had some kind of Glamour Catalogue like WoW this problem would go away, and I doubt anyone would need more space. I know it's a lot of work, but this problem will never be solved until the work is put in to create an actual solution.