This argument never makes a lick of sense, these are entirely different problems. Trains, buses, subways, do not go to my house, and they do not go to my destination. They (sometimes) get close, and then I have to get through the last mile somehow, often a taxi or Uber. That transfer alone is annoying and it often makes sense to just take the taxi the whole way, even if it costs more, and it's a better experience than any public transit, so why not?
Maybe that setup works in China where everyone lives on top of each other in shoeboxes and you can just route a monorail through an apartment building, but I like both having my space and living adjacent to a large city. You could put a teleporter to the train station on my boulevard and I'd stand next to it while I wait for an Uber. You could build a train station a block from my house and I'd move somewhere else. I would pay multiples of any train ticket price to get into an autonomous sleeper Waymo and wake up in a city hours away in front of my hotel. You literally could not pay me to take more public transit if I have any other option, and I don't think I'm alone in that, and building more of it doesn't solve that.
America's strength here is that it's full of great places where you can live like that, take public transit everywhere, walk everywhere else, if that's what you want, with the compromises it comes with. But instead of moving to those places people say "build more public transit", which then just sounds like "I wish public transit was more accessible to me specifically" and then we're just back at taxis, or building rail to connect the front doors of everyone on earth.
