It's not a new thing. (Destiny)

by Kermit , Raleigh, NC, Sunday, October 09, 2016, 19:00 (2970 days ago) @ Avateur

To reply to your other post, no one was running around picking up greens. Those are worthless. We had run into so many engrams during the encounter that all of our armor and weapon slots were filled, and some were worried about their postmasters being full. We weren't all able to pick up the engrams and drops from defeating the boss, so those needed to be cleared out and some things moved around. Additionally, we didn't know there would be a quest waiting for us in the last chest, and there were fears that whatever items might be in there would be lost if the postmaster and such were full and no slots were open on the characters themselves.

It's extremely unlikely that that would happen. Items already at the postmaster might get pushed out, but it's first in first out. The time to think about this isn't after killing the final raid boss, which is why it's routine for people to make tower runs during breaks in the raid. This quest is a bit different in that the person who unlocks it does has to stay in the raid until completion--at least that's how it was explained to me.

Also, although I'm sorry it happened to you, the "Bungie not respecting your time" rhetoric is over the top.
This really is different from other issues where that statement might apply. Bungie giving us five minutes to dick around in the final raid room I've always seen as a generosity on their part, and the fact that you didn't know about it is says something about how non-consequential it's been.