From end game where? PvP or a Nightfall Strike? I don't remember people getting them in any of the end game rolls for regular Strikes prior to last week and so your test basis is just the last few days and with all of this it's random chance. Also if you rushed through those Strikes and avoided a bunch of the enemies or your teammates killed a lot of them and you weren't close enough by them when they did you drastically lowered your chances.
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I haven't played in the past few days. I'd say PVP and Strikes, if I were ever so lucky. Usually the engrams I got in the boss area (Nexus usually) gave blues and ever so rarly a purple. My blues sometimes turned purple and my purples were almost always legendaries. My teammates are usually the ones rushing too, lol. So what if you're unlucky, it's okay.