For those who ride/own folding bikes, what are your reasons for favoring them over a regular bike? Every metro area I’ve lived in allows bikes on trains and ci

For those who ride/own folding bikes, what are your reasons for favoring them over a regular bike? Every metro area I’ve lived in allows bikes on trains and city busses have racks on the front. Leaving a bike in a secure lobby/hallway, garage has almost always been an option. That said, I don’t hesitate to chain mine up on the street either, so I’m having trouble seeing a folding bike as offering any advantage in most situations, especially considering the compromises that are often made in comfort and performance.