T90 gear needs another way to get the unpowered seals GW2 bosses are really hard when you suffer from bad latency, or your locale network crashes all the time.
No clue why they have to center everything around PvMers or PvPers
It is really no different from weapons and armor for the other combat styles. Take a look at what you have to fight in order to get level 90 power armor for melee, ranged and magic. If you can't get it for necromancy, you certainly can't get it for those either.