Of course, people whose workload consists of talking to or otherwise dealing with other people can't have flexible schedules like this. A cashier can't walk off

Of course, people whose workload consists of talking to or otherwise dealing with other people can't have flexible schedules like this. A cashier can't walk off, because there's a line of customers waiting to be served. However, it can still in my opinion work for a large amount of people. Anyone whose job has parts that can be done alone (programming, compiling reports, writing articles...) can benefit from a more relaxed schedule.