I always upvote this idea in hopes that SE will relent from their current stance. We know it's not 'impossible' based on the evidence of other games doing it. With the current system there are several annoying limitations. Gear used by multiple jobs (current BiS crafting and gathering gear for example) can only be glamoured for one class/ job. You have to reglamour things every time you upgrade. The inventory bloat caused by the enormous and supurfluous variety of glamour prisms prevents most players from keeping any glamour prisms in stock.

The way it is currently I pretty much don't mess with glamour at all. I'd have different looks set up if I could just set them and leave them independent of upgrading equipment, but when every upgrade means pulling out the old equipment and crafting a few prisms to return my look to the way I had it, I just can't be bothered. Moreover I'm usually more likely to do it on my crafting classes where it's not really available all the time.