Simple and to the point, the number of Relic weapons in this game is becoming staggering, as of EW, there are 74 Relic Weapons for combat jobs alone, this number will increase to 95 in DT once the new wave of Relics starts coming out, even assuming you gave up your Zeta weapons for Anima materials, something a collector might want to avoid, that's still 85 items to take up space on a Retainer or in your Armory Chest.

This does not take in account DoL/DoH Relics, since those can be shoved in the Glamour Dresser, but if you count them, that total increases to 96 in EW, and a foreseen 128 in DT, a staggering amount of items.

We need a dedicated storage for Relics, even if there are caveats to this, such as giving up your custom stats and needing to go through the process to them if you want them later, but something would be immensely helpful.