It’s because driving on the freeway isn’t FSD, it’s a better version of cruise control, and other companies also offer similar capabilities. Within a city, the thing is a shitshow. It does random things all the time and it’s almost a larger cognitive burden on me to constantly be on the lookout for it to make mistake where I have to take over vs me just driving the car myself. For me specifically, it’s just impossible to drive because it fails to recognize curved streets and a couple of other irregularities just within blocks of where I live.