Sounds like a comparison of revolvers and auto pistols, not really a good comparison.
As to triggers, I know of no handguns (except full auto) that don't require that the trigger be released before pulling it to fire the next round.
I think Kalgalath had an S&W Sigma, a Glock type. When he talks about not having the trigger return all the way, he seems to be referring to a DA/SA auto pistol where the first shot is DA, but the next shots are SA so the trigger has a short return stroke. That is a function of the trigger mechanism of the pistol and has nothing to do with a transfer bar, which is used only on revolvers.