The Bay area sounds excessive, but consider that under the ancestor's idea, you couldn't do that if you were concerned with reducing your risk of infection.
I'm 53. I have asthma and I really hate hospitals. Right now, I have been going for groceries about once a week. I've gone to some appointments, but I've cancelled others. I've been getting take-out some, and I even went on one shopping expedition for craft supplies. I'm relatively comfortable with that because, while I have to assume everyone else is potentially infected, I can also assume that most of them are taking steps to protect me---a mask is significantly more effective at preventing spread from someone infected than it is at preventing an infection of the wearer.
Close quarantine means no going to the store at all. Not going for walks. It specifically means no human contact outside the people you are quarantined with.
