It's not even waits at bathroom lines (which are fine once the show starts). It's the simple act of having to leave your spot. The fomo is that strong.
They don't want to give up their spot on the rail. And they lack the confidence/assertiveness to work their way through the crowd back to their spot.
The general lack of proper crowd etiquette and insistence on being part of the show I attribute to streamer/online culture. It's not enough to be there, you've got to be acknowledged. This does predate the pandemic. But what the pandemic did was give these already learned behaviors a void of a couple years for those behaviors to fester without check.