The title says it all. I am sick of logging on every Friday only to see that Xur doesn't have anything I need for my character. It is just annoying.
Xur isn't random. He hates Warlocks. Bungie needs to address this.
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Unfortunately, there really aren't that many Exotic choices and it is intentional that not all of them can be purchased. Some of them are explicitly ONLY available through random drops, so that they are rare and special. Otherwise, everyone would have every exotic available. Xur was meant to be a way for some of the unlucky players that were having a hard time getting these random exotic drops, to at least get something exotic by working their butts off to collect Strange Coins. With the level 30 gear available through the Iron Banner, that sort of reduces the need for the exotics anyway.