Glamour log would be nice just as a UX improvement that would also have inventory space improvements as a result.

That said, even if you play all DoW/DoM/DoH/DoL, your armory alone easily has enough space for all current gear, and your glamour can be kept within a few pages on one retainer, so I'm not sure how anyone would need more than TWO retainers (one for mats, one for glamour).

Do you really NEED to keep that one sprig of Belladonna that you got 4 years ago? Liquidate materials you don't think you'll be needing any time soon and buy them again when you need them. Using the MB is not the end of the world. It's highly likely that 1/4 of the things you're hoarding you can purchase for less than 50 gil in the future.