I agree in general, but think you might have it backwards in this particular case. Simple is better, but if the only way to ensure it gets through is to make it more complicated, then let's add the modifications.
Getting 'right of way', building permits, hiring firms, planning massive construction projects involving 'new technology' etc. etc - this is 'complicated' beyond the threshold that I would trust the NYC government.
But some kind of tax on cars is within feasibility.