Going through the ARR Relic Weapon quest has proven to be quite a time-sink, although it's definitely given me an appreciation for what it took to get these awesome weapons back in the day!
When it comes to getting ADDITIONAL Relics of the same expansion, however, I feel like it would be nice to speed things up a bit here and there, at least on the most tedious steps.
For example, once you've completed the ARR Relic, maybe working on the second and beyond, you need only complete 1-3 of the "Books", maybe you only need 50 materia instead of 75 (35+15 for PLD), and for the Light infusion, maybe the values are multiplied 5x-10x?
Or if it's not TOO much work, maybe the amount of work is a little less for EACH Relic you make, so those interested in collecting them all can actually do so in their lifetime.
As a related but SEPARATE suggestion, I would like to suggest adding BLU Relics to all LEGACY Relic Weapon quest-chains. There are multiple reasons:
1. Considering there are only a couple of "Canes" in the entire game, it should be super easy for the team to create some new designs, and apply some glowy effects.
2. It gives Blue Mages even MORE content they can run on their own, which is sort of the main draw of the Job for a lot of players!
3. It gives players an arguably "easier" path for experiencing the STORY of the Relic Weapons, particularly for players like me who primarily play jobs acquired in LATER expansions.
Now, seeing as I've yet to do a whole lot on the Bozjan front, that might mean the BLU needs a modified means of acquisition and upgrading. I don't really know how much is involved there, so that could be way more work than I realize. If that is the case, and you don't want to allow BLU's to run Bozjan content, then maybe provide Relics up through Stormblood, and they can maybe get more Relics down the road, when Bozja is so obsolete that there's no issue allow BLU's to run around there.
I think both of these suggestions would just make getting Relics way more approachable, since you wouldn't feel like "I guess I'll try and get ONE and then bounce". Or like me, I really didn't get a good enough look at the ARR Relics for WAR, and now I'm sort of regretting going for the PLD ones (in fact, WAR's have some really good Relics start to finish, although I'd say the final Shadowbringers one, Paladins have the best one).
Just my two cents!