I noticed ever since covid and constant premium CC signup bonus / status extension by spending, often time half of the plane is in zone 2...
I flew out of LAX last year, the queue was wrapped around all the way to the lounge entrance to fill up an A330.
So are many instances on widebody flights between YYZ-YUL... It was total chaos. I suspect there were more zone 2 than zone 3 and 4 combined. I have given up fighting for bin space, either pack light or check my carryon regardless.