But if you're just going to sit AFK in Legend Haunted Lost Sectors until the boss spawns, at least do it in a full fireteam so you aren't, y'know, actively griefing your teammates.
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From the distant past I can hear echoes... "my teammates are afking in the forges for umbrals its annoying!!!!!" Really, I don't blame people for taking a lazy route around a poorly rewarding activity. If Bungie designed it so you could get multiple engrams based on headless ones defeated players wouldn't go AFK at all as defeating the headless ones would grant more rewards.