You're probably thinking "he just wants more glamours for that stupid Blue Mage class!", which isn't necessarily inaccurate, but also not the POINT of this suggestion.
See, I originally played a Miqo'te Monk in ARR, and did some of the quests to get him his original Relic Weapon, and started the Zodiac quest-chain. Fast-forward a whole lotta years and expansions later, and I've been playing a NEW character, and since I was bored yesterday, I decided to go back and start doing that.
Now, my main Job is a DRK, but since the DRK didn't exist during ARR, I decided to go with Paladin, because mine was lvl 60. Well, even at 60 those opening lvl 50 quests are a huge chore. There's no getting around or overpowering those dungeons or boss-fights (unless you have friends willing to, which I did towards the end once they were online).
Even so, I only managed to get to the Zenith stage, when I got the quest for officially starting the Zodiac chain to upgrade to Atma, which requires grinding out a whole buncha FATE's.
Essentially, game expects you to play -- and play the CRAP out of -- the given Class you're pursuing a Zodiac weapon for. SHOCKING!!! I know...
Here's the thing, though; we've got a WHOOOOOLE bunch of new Jobs over the years, which don't all have the capacity to do those older Relic weapons. And we're only getting more Jobs. And the idea of adding all-new Relics for all of THOSE jobs -- and all FUTURE jobs -- seems pretty crazy.
Well, the Blue Mage kind of strikes me as a perfect solution:
For one, there are only like, what, FOUR unique Canes (or whatever you call their weapon) in the game, a couple of them recolors. So realistically, coming up with new designed should be EXCEPTIONALLY easy, since there's so few to begin with.
Secondly, it gives a relatively easy option for those players whose favorite job DOESN'T have relevant Relics for each given expansion. And since those weapons are obsolete, it doesn't really matter that they *might* have an easier time grinding certain stages of the quest-chain, because at this point, the only people doing it are those who just want to see the STORY of these weapons,
All in all, I just feel like this would be a nice option to have added, it SEEMS like it wouldn't require all that much work (what, 5-10 new Cane designs, and some variations with different particle-effects?), but would make that story a lot more accessible.
Beyond that, I might suggest tuning down SOME of the grinding elements for past content, since I don't think it's super reasonable to expect players to grind old content for months, just to progress old story for outdated weapons. But maybe others feel the grind should stay, so that's just me!