Working 9-To-5 Is An Antiquated Relic From The Past And Should Be Stopped Right Now

Since remote work has shown that it is beneficial for both workers and management, it makes sense to see what other standardly accepted practices need to be adjusted. Why is it necessary to work from 9 a.m. to 5 p.m., five days a week, in a sterile cubicle farm with harsh fluorescent lights, little access to window views, sitting in uncomfortable chairs, poor ventilation and its either too hot or cold?