That is not universal. That is a subset of work-from-home. Many people working from home can no more step away for a break than they would if at the office. For instance, customer support/contact people cannot just step away from the phone. Others working at home have employer systems that monitor them live. Any unscheduled breaks get noticed and recorded.
Even amongst highly-paid "knowledge workers" there are issues. I do occasional home days but am not able to take breaks. At any time one of my five bosses might call. We don't have any monitoring software but they expect me at my desk ready to respond, not walking the dog or doing laundry.