I would love to see the PLD sword and shield sets moved into a single item AND THEN:
Allow left and right weapons/shields to be individually glamoured. This could easily apply to NIN and maybe RDM, AST, and any other job that has two pieces to their kit that can be non-symmetrical. I could see this apply to paint brush and palette even.
It would simplify a lot of item management and remove the PLD tax, while leaving the option for more glamour options for other jobs.