"it takes three minutes to get the corner off." Danny O'Rourke of the Columbus Crew.
That's as damning a statement as can be found that the streamers affect the run of play - MLS admins need to first admit that, and then do something about it. It's not merely atmosphere when it holds up the game.
Streamers are basically like streakers at that point. People may think they're cool, but it's still illegal and not allowed, and certainly not condoned the way Garber and a few other people did at one point.