You know what I found fascinating about this Covid/ home from work thing? How little the concept of On Time meant. Sure, there are deadlines but having to do/be at work at specific time? It was just nonsense made up by rich elites
For the most part, no. For a start, we work during the day because it's better for our health (sleep disruption is bad), plus being easier and cheaper (warmth, light, etc.)
Working hours also partly act to protect workers - such as from the expectation that they are constantly on demand. I have had students who email me at 10pm at night and send me a message at 9am the next morning complaining I have not answered them. They can fuck right off, and if my employer ever expected that of me, they could fuck right off too.
Secondly, in order for a team to work, the team has to be prepared to be available at certain times because they need to sort stuff out. Staff being guaranteed available in certain hours is a huge benefit to getting things done, especially in an emergency where you can't afford to wait 6h between emails because everyone's on different shifts.
Where I would agree with you is that there are certain jobs or tasks - usually where the workers needs to get things done individually - where the deadline matters but a daily schedule doesn't. But a huge amount of necessary work people do does not fit into this model.