You should be able to equip 3 exotic weapons at all times. I understand not being able to equip all exotic armor, but exotic weapons are no better than raid weapons you get. Some are worse.
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All exotic armor means you'll never need to buy or obtain anything to be the max level. They are no Raid weapons better than having Suros, Icebreaker, Ghorn combo. You can handle anything in this game with that combo and nothing from any Raid would be a superior trio.