I do that, too - but it's because you need the gap to be able to turn away briefly to assess the traffic you will merge into while preserving enough margin to react when the idiot brakes sharply or stops when they get into the breechWhile those are annoying you would probably think I need at least 3 curb stompings. When I get behind an idiot like that I go even slower to create distance so I can then speed up and merge at a proper speed.
Its like they are running 8088s with no cache for brain processors