Using one hand works for me too. But I recognize it as being necessarily less efficient even if out of laziness I choose to do it.
Using a straight, I feel that skin stretching insures a closer shave, especially when going atg. It helps in “standing the hair up” . Perhaps more necessary the thicker the beard
I stretch my skin along with shaving faces and such. More important with a shavette but still a good idea. If you have a open seat I will jump on board this one. Good becomes even better with a little effort.