Something I've noticed is that ornamental armors (Addy and Rune Heraldic armor, trimmed, gilded, and God Rune Armors) are only equivalent to the unupgraded armors; I feel that they would have more value if they got boosted to the stats of fully-upgraded armor (So Heraldic addy would have the stats of Addy +2, ornamental rune would have the stats of Rune +3, and so on).
Similarly, Dragon weapons and armor should be boosted to the equivalent of orikalkum +3; aside from collectors or people who already have them, there's not much incentive to chase Dragon equipment when orikalkum +3 is just better, despite being made of the same metal and a lorewise inferior method since we don't have a tame dragon to smelt orikalkum with/can't use POF dragons to smelt it. I suppose Corrupt Dragon equipment should be included as well.
I can see an argument for it not being worth it since addy, rune, and dragon are mid-game gear now (Well, Rune is still endgame for F2P, but I digress), but given the recent efforts to give RS a more consistent visual tone, I think it's worth cleaning up little mechanical oddities like this too, especially when the rare version of the item that you have to go out of your way to get and hope the RNG is in your favor is worse than the version you can just make in Falador in way less time.
Edit: Alternatively, why not give us the option to upgrade them similarly to how we can upgrade regular armors already?