Hey there,
Since the patch that came out about a month ago that fixed that every purple engram you get, you would be guaranteed to get a purple, I haven't had a single purple engram drop from enemies.
However, I do get them as rewards rarely for crucible and strikes and such, but never anymore from enemy drops.
Before that patch I would still get one every once in a while (not often either, but that's why it's legendary).
My question: is it only me that hasn't had a legendary engram drop, or are there more of you out there?
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Today I had a legendary engram drop while I was doing the nightfall solo. Before today, the last time I saw a legendary drop was last week. I had two legendary engrams drop right next to each other during the nightfall (The Nexus), then I got two more as a reward for doing the weekly heroic strike on level 28 right afterwards. So yeah, they're still dropping, but as someone else said, at a much lower rate.