trains still need sidings, along with a bunch of marshaling infrastructure that doesn't really have an equivalent for cars
yes the reason a rail line to take you directly from your house to your local convenience store wouldn't be profitable is because people would refuse to use it
what argument are you making here? this was in response to how rare private roads are in comparison to private rail, and your response is that actually they're not rare? are you just trying to disagree with everything i'm saying for the sake of disagreeing?