Encouraging people to live attached to a subway and then incentivizing their usage of it, regardless of distance in almost any circumstance, is a huge transit e

Encouraging people to live attached to a subway and then incentivizing their usage of it, regardless of distance in almost any circumstance, is a huge transit efficiency boon for the economy. If you price people out of the trains so they start driving cars again or even taking busses you are suddenly losing a huge amount of volumetric efficiency in your transit system. Optimal cities can get almost everyone anywhere either walking, biking, or riding train all the time. Any requirement for road bound vehicles is an infrastructure failure of city planning. There are exceptional circumstances (moving heavy items that can't be carried) but they should be just that - exceptional, and rare.