Idea: Make Endgame Dungeon gear sellable or One role specific piece garunteed per run

I don't know if a similar topic has been discussed on Forums yet, but how many of you out there love to glamour yourself in some of the dungeon gear drops, but you don't want to run said dungeon over and over again (for whatever reason) for said items?

I bring this up because I really want the Skallic Tank body piece but I've run this dungeon almost over a hundred times I feel like (I don't think I've ran it that many times but I bet its getting pretty close by now) and still no Tank chest piece. This is even worse if your a DPS.

So I was thinking why not either make endgame dungeons have one guaranteed piece like Heavensward and Stormblood MS dungeons or make the gear sellable on the market board? Or perhaps something else entirely that I haven't thought of?

Would love to hear from the Devs on this.

(Edit) I just remembered that the latest dungeon Swallows Compass has an additional chest after the 2nd boss that also drops body and leg pieces. Once had a run with both chests dropped Tank body. So this may be SE trying to make the gear grind easier.