It just means that there will be more capacity for the length of road that has matching side roads. Couple with the buffering issue of people not starting up

It just means that there will be more capacity for the length of road that has matching side roads. Couple with the buffering issue of people not starting up fast enough when they have to stop for traffic, and it is an overall gain. Think about when there are two lanes merging into one. If everyone gets over early it dramatically slows down, but if everyone merges last minute like a zipper it is not as bad.