So I don't know if it's new with Argus (spent as little time as was possible on Borked Shore) but anyone noticed that when you arrive to world quest areas, especially rares, and you're alone, the game populates the area "for you"?
I stood at Houndmaster Keraxx totally alone, Warframe was on CD, queued myself in the group finder, and boom, 4-5 people phased in at the rare (they didn't arrive, they just literally phased in fom thin air), without them being/joining in my group. Cool! (Not sure if queing has anything to do with it tho, because I looked for groups and there was none.)
Or maybe I'm crazy and I started imagining things, you tell me.