If it only pertained to raid gear and provided bonuses that affected the raid (including most pve content) it's a pretty cool idea. I do see a benefit though to not having "set bonuses": it allows players to play in the armor they want to play in and also allows them to better synergize their preferred exotic armor with the current selection of armor (raid or otherwise). And it prevents an armor meta, if you play "the division" you should be well aware how this can affect a game.