Well, water metering is effectively libertarian, but that doesn’t make it bad. Every ideology has some good ideas. 
This is back to point #1 in my previous numbered list, though- water metering is relatively easy to do, so fair direct user fees are practical (though we still have subsidies and tax deductions for the poor, because it is still slightly regressive). I’ve yet to see a practical implementation of “road metering” that isn’t wildly unfair to poor people, though, and that’s where (in my opinion) social justice has to override ideals of resource allocation (for now- see below). Even water metering is relatively new, as recent technology has made this practical to do. Water rates used to be flat because the idea of putting a special meter on every single house and apartment seemed ludicrous in the 1970s. I specifically remember dinner table conversations at our house back then about what a stupidly impractical and expensive idea that was, and how it will never happen. 
You could certainly argue that we have the technology to do something similar for cars now (and perhaps that’s what other people are arguing for in this thread) but there’s certainly a can of worms on personal privacy, data security, and other issues. As soon as the metering system involves tracking movement of citizens, the hairs on the back of my constitution go up.
I think we’re all basically in agreement on the ideals and perhaps even the ultimate goal here. I think there’s only a gap in short term implementations.
