alt Hacker NewsThe answer to both of your points is that mass transit is used for most of the travel and the last mile is taxi equivalent. Being unable to do the last mile is a common reason not to take mass transit, so more usable taxi equivalents tends to increase mass transit use. And most directly, taxi equivalents are often significantly more expensive or significantly than mass transit at crossing cities.
Maybe just an artifact of where I live (Los Angeles), but whenever Ive considered taking Waymo to the train station, it's usually easier and often cheaper to take it all the way to my destination. eg right now a Waymo to the train station is $16, then you wait 0-15 minutes to hop on the train, paying an additional $3.50 round trip. I'm pretty pro-transit, but I can't deny that the ipace is a much more pleasant experience than the train (I can play my music, don't have to listen to other people, guaranteed seating, guaranteed AC, fewer undesired encounters with strangers).
Meanwhile, a waymo to a stadium on that same train line is $26. If you're with 1-3 other people, taking Waymo all the way is a no-brainer.