Well, yeah, but I think we shouldn't have to think up where the lines are to be drawn w.r.t. when an employee should or should not be granted time off. I think employees should be able not to work whenever they want.

I can see how this would cause problems, but I also have a solution.

So, companies would presumably suffer because sometimes they'd have a lack of employees, or even be missing a key employee. But what if every company had a pool of many more employees than they actually need on a daily basis, so at any given time they can use however many they need?

But how would you do that, when all those people you're not using need to make a living so would have other jobs?

The answer is that everyone would have many simultaneous jobs and this would allow them to work whenever they feel like working by going to whichever of their jobs needs someone at the moment. Each person would be trained and skilled at each job they're signed up for.

This would make work a lot less monotonous and somewhat more fulfilling because there would be more variation in one's tasks and environment and a greater amount of learning, knowledge and skills involved.

Of course, if everyone can take off work whenever they want, what would companies do on holidays, when Christmas is coming up, etc., when nobody wants to work? The answer is just to pay more for those days to increase demand for someone in their pool to want to work. That way you let the market solve the problem and the employees get the extra compensation they deserve for working at inconvenient times.