That's only because some manual cars have acceleration on their clutch but many others don't. I've driven some that don't have it and if you don't know how to d

That's only because some manual cars have acceleration on their clutch but many others don't. I've driven some that don't have it and if you don't know how to do it, your engine will stop and you'll have to reignite it (with the annoyance of people honking at you). It's also an annoyance when the traffic moves at different pace in a traffic jam because you have to stop, switch to first gear, move slowly, if the cars are moving fast enough switch to second gear, if they stop back again to first gear... If you are lucky enough and you are in a slope road, you can go without any gear selected and just use the brakes.