Let's be honest: fashion is the ultimate endgame in GW2. Whether you like legendary shinies or eye-bleeding infusions or gemstore flavors of the month. Or course, fashion only exists in the eye of the permafrost of the abyss dye.
Anyway, there are two crucial missing features in the GW2 endgame:
1/ players need to be able to examine other players (to get a flavor of their awesomeness, obviously)
2/ players need to be able to copy/paste transmogs (item skins and dyes) in order to educate fashion peons