why are you comparing a public system to a private one. they can't compare at all.
While operated only on WDW-owned property and by Walt Disney World, it absolutely IS public transportation, subject to the same laws and rules as any public transit system - and so it's entirely reasonable to compare it to any public bus system.
secondly most of the bus drivers - especially when the parks are closed - check (or should check) their buses before they leave the resort to go where they are next assigned.
been on SSR and OKW a couple of times at closing - and there were some guests do did not where they were staying. some even argued with the bus driver - but at both places because
DVC go often enough that they generally know the place - were there to help.
in the old days before Disney new system. the bus driver when leaving the parks (remember all the parks are closed only DD is open) -would ask where everyone was going. If only one or two stops that is all he would make.
this system to me is much better, everyone is tired at night - and the sooner you get back to your room the better for everyone. to have the bus driver follow this silly rule even when everything is closed. Is silly.
now the opposite happens to us - once the bus driver after only stopings at 2 stops before she decided to leave. when I said something - 2 other people were telling me to be quiet. Guess they did not want to be at my resort and got on the wrong bus. she did turn around the bus and went back to SSR and finished delivering SSR guest before going to where ever these guest wanted to go.
just last month, the bus driver asked if anyone was going to BB. no one was, so we skipped it.