I would prefer every single exotic item be linked to a tedious quest line, or even RNG quests like the Thorn.
That way, its harder and time consuming to gain each exotic, i can pick which one to start working on, and maybe not everyone will have it.
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And as for Xur, have him sell exclusive things that are for leveling up the exotics. Like, it cant be fully leveled without purchasing items from him or something.