Here is a way to keep VoG and CE's raid gear useful without taking away the fact that you have to do kings fall to get end game armour. Just make it infusable and if players want to look like vex or hive and not... whatever Kings fall raid armour looks like, they would still have to collect all the kings fall armour at the highest possible level.
Just an idea
BTW
I mean only for armour, NOT weapons.
Edit
PoE as well.
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Oooorrrr we can just add a transmogrification process to the game. Make any non exotic weapon or amour look like a different piece of legendary weapon or armour (that you own or did own at some point) for the cost of 3 legendary marks. I've been wanting that for a while.