If a person wants, he can work all the days of the week, but if he works like this, he will definitely be at risk of health in the long run. Moreover, holidays are usually fixed for his personal. When these days are spent with the family, a person gets pleasure from this time, which is very useful for him. There are some people who are very greedy for money, they keep working without taking any rest due to greed for more money, they are definitely harming their interests. Although it is not seen in the short term, but in the long term, the person can feel it. I think holidays are completely a person's personal life and if he does not spend this time, but gives it to the family, then the family is also satisfied, he himself can enjoy and take rest.
Perhaps greed plays a role here too, maybe it concerns workaholics, those who cannot imagine their life without work, but work can also be different, for some it can take several hours, for others it is necessary to work all day. But holidays should be a full rest, if you need to think about work, or even more so continue to work, then the rest will not be full. Those who know how to separate work and rest will be able to perform their duties better, this is a simple truth that cannot be changed.