Stream's down. Maybe he's finally noticed the major flaws of the new voting system.
Because of input lag, even after we say, get to the farthest right point of the invisible floor, right commands will still be inputted for like 20 seconds after we get there, even without trolls present. Pressing start allows these right commands to be inputted without sending us back to the beginning, and gives time for people to start pressing up so we can move on.
So yes, start is a "buffer" for extraneous commands and dealing with lag. If this gym is ever possible in anarchy (it's not), we'd need tons of start spam to do it.