Sufficient determination reads as a lot of free time and few responsibilities. It's not realistic, even in a city like Seattle, for anyone outside of maybe their 20s.

NYC, sure.

Kind of true in the downtown areas of many large cities, but becomes pretty untrue once you get further out there.

Whenever I travel for work I usually try to first experience what its like walking, taking transit, and then finally take rideshare/taxis. I often find a lot of the cities I've been to, you end up practically relying on rideshares unless you're down to walk through spaces which are very unsafe for pedestrians and have some rather long walks. I often end up renting cars on second trips to those cities.