Guild Wars 2

we are able to change the stats on Bloodstone Fen trinkets by purchasing the stats reset item using unbound magics, but why are we not able to do the same with the trinkets from other maps ? any plan in the future to enable us to do that ?

Probably because blood rubies are a pain to obtain as opposed to winterberries where you can literally get a ring, earring and backpack within a couple hours from berry farming on alts.