If it changes either play time needs to be taken into account or just make all exotics acquired from xur purchase with high requirements.
3 months of raids, nightfalls, and weeklies stuff plus a 150 strange coins to get Ghorn, etc.
It makes it a pain still but there is work involved unlike the rng lottery. Not every one does each raid on hard, nightfalls, and weekly strike every week.
(You don't earn anything given by chance, so this lets you earn an exotic by working for it).
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So if I spend 2 hours doing the Crota raid an end up getting an exotic I didn't earn that weapon? And that's what this game is all about? Exotics aren't meant to be purchased by everyone. They are meant to be found! That's what makes this game so fun is grinding for chances and then when you end up getting the exotic you want, it feels so great! But when Xùr sells exotics, it's literally 2 missions and you have some of the rates equipment in the game. Imo just get rid of Xùr in general and start putting armor in for random drops too