Man when I hear some of these arguments against all-class glamours I feel like these people's heads would explode if they tried playing XI. In there different jobs can wield the same weapons, cast from similar spell lists, AND glamour any and all armor they want.
I'm all for adding the option to equip whatever we want as glamour with the possible exception of Job-specific gear (job, not class) but if the root problem is a technical issue stemming from the equipment system I wish they'd follow through on their old promise for transparency and just list out why it can't work, technical babble be damned. I've had almost 20 years of XI's devs giving the same non-answers and XIV's playbook has devolved to the same thing over time.