Nor does GM understand ticketing nuances or optimized route costs. (discount cards, demand-based pricing). This is a big problem in cities without integrated fare systems. In many places, 3rd party planner apps are a must.
The solution to that is to get rid of the nuance and optimization opportunities and turn them into a small across-the-board discount. Far fairer.
Google Maps does offer "Buy Ticket" buttons for a number of agencies that have opened up their systems. They're far from universal coverage. But a new Uber for Transit would snap up the APIs Google has worked to open up and then be in the same position.
Because its not the interface on your phone to do that. On iPhone at least, you have apple wallet and transit agency cards often interface through those means. That's a much better system as you can access it when your phone is dead, unlike something that might be bounded behind google maps.
