I, for one, like WoW's idea of leveling the weapon WITH us as we progress. However, I can't say I like WoW's method of development, back during Legion, other than the unlock quest at the start for the weapon. Stormblood ALMOST tried something similar with our level 70 job quest weapons, but that led into Eureka, and... ugh.

What we need is a weapon that does level with us as we progress, but doesn't require a mind-numbing, finger-mutilating, grind of mobs (or much in the way of rng). What we need is a weapon that stays relevant for more than a month as soon as we get it. Likewise, we need more activity in the world.

So, instead of doing Eureka again, or just telling people "Go do FATEs and/or dungeons ad nauseum," make little quests or objectives that explore the design choices of certain areas (like that boat in Peaks, or other structures), or put additional use to spots. Job quests have tried sending as back to certain areas in ARR zones, but it wasn't enough. Please, send us out with neat little dailies and weeklies to explore the world further, enjoy it more, as to supplement the other means to acquire materials for upgrades. Then cap off the upgrades per patch so you don't have i500 weapons when everything else is i430-440.