My point remains as thus:

If you are bothered by the idea of someone else wearing gear you don't want them to wear, why? How does it impact your experience? And why should your desire to not see players wearing gear they want be more important than another players desire to dress their character as they see fit?

If your answer is immersion, then how are you not already bothered by the freedom players have in wearing joke gear, or other Final Fantasy traditional outfits like Cloud's outfit regardless of their job? If that doesn't bother you, someone wearing SGE's robe as a SCH, BRD's pants as a RDM, or GNB's gloves on a NIN won't bother you either. If you are bothered by that, then why does it matter if artifact gear is freed up also? The damage is already done. Keeping artifact gear hostage is not going to magically make the existing "issue" of immersion any better. You've already gotten used to it.