DC is still easier to navigate by car than by metro and bus, at least when I last lived there in 2016. Red line from MD would regularly shut down or have delays, and you were looking at a 2+ hour commute into the district. If you could get a parking spot you could reliably beat metro by about 10 minutes with much less variance. And you cannot navigate a circumferential route in a reasonable time, the purple line is the first to really attempt this and is like a drop in the bucket. If you live and work in the city it’s doable, but cross a river or the beltway and it’s really not. I had friends in Baltimore that could not get by without a car either, and they made a really dedicated effort. Mass transit in the US - outside of NYC - is just not viable at scale.