Again... LA has a surprisingly extensive subway system. NYC, SF, Miami, DC, and Chicago all have robust public transit. Even San Jose and Seattle have non-negligible transit alternatives.
Austin has essentially nothing, the train they built is legitimately the dumbest, cheapest option that was offered at the time, though they are building dense housing along it now. People often choose which side of the river to live on because of traffic. You're simply not going to convince me that Austin isn't one of the worst cities to commute in, because unless you want to bike in 100ºF heat, you literally have no choice but to engage in it, especially if you have to cross the river.