lol the number of responses saying “just go buy a cheap weapon and then sell it / go grab a weapon from your retainer or armoire and then put it back” are completely missing the point. Yes, this is also what I do (or, for my DoH/DoL I simply equip my Aesthete’s). However, that doesn’t change the fact that this is poorly programmed and requires you to have a random extra item unrelated to the quests to even do these quests. As LineageRazor said, this is by definition poor design.

Just as an example, the first time players go to Gangos to upgrade their relic weapons from 485 to 500, there’s nothing that tells them that they need to have an extra weapon for the relevant class/job on them. So you go to the Doman Enclave, teleport from there to Gangos, and then realize this problem; from there, you can either go back to the Doman Enclave (if you have a spare weapon for the relevant class/job on your retainer) or teleport to a town with a cheap weapon and then come back to the Doman Enclave and then Gangos again. It’s annoying / poorly designed, and I don’t understand the apologists here who say otherwise.