Glamour is a massive part of FFXIV's sense of personal progression and a big part of our community, and I think I speak for many of us when I say that players should be allowed to glamour equipment that is otherwise restricted to a different role (i.e. the ability glamour "of Striking" gear to a Red Mage).
From my own experience as someone who plays as a Healer and Physical Ranged, I am constantly disappointed in "of Aiming" and "of Healing" gear, not because it's inherently bad, but because it's just not my particular style. Almost every single time we get new equipment, I'm far more enamored by "of Striking" "of Scouting" and "of Maiming" gear and would love to mix and match to fit personal style on the jobs I enjoy playing. This is already something that's done regularly on NPC characters regardless of whichever class or job they are given.
I have seen that in the past this was discussed negatively for reasons like "it wouldn't make sense to see a Black Mage wearing armor," but a Black Mage already can wear armor as there are many examples of armored equipment that has no gear restrictions, such as the Final Fantasy I Warrior of Light's equipment. We can see Paladins wearing a chicken costume, White Mages wearing Squall Leonhart's outfit, Ninjas in a wedding dress, and so many other examples of unorthodox glamour, that I don't see any reason why we need to continue restricting jobs from using other role's equipment for glamours.
Some limitations: It's understandable that weapons would be an exception to this QoL improvement as they are directly linked to the animations of each job and would start to look very unusual if, for example, you were able to glamour a Warrior's Axe to look like an Astrologian's astrolobe. That much is understandable.
I could also understand wanting to keep job-specific artifact gear as exclusive to that respective job for thematic reasons.
Alternative solution: If unrestricting all gear is out of the question, can we please see the return of level 1, unrestricted replica gear? In the past, two sets of equipment, the Sky Rat and Sky Pirate's gear lines were given replica variations that are equippable by any job and thus a Scholar can equip the Replica Sky Pirate's jacket of Fending, for example. There are many very popular sets of gear that are worthy of receiving the same treatment, such as the YorHa sets from Nier: Automata, the Moonward tomestone sets representing four of the main Final Fantasy IV characters, or other popular options.