So that the employer will see him more favorably than the other employees at the same level when making decisions in which all other things are equal.
From the candor of GP's comment, I would venture to guess that both he and the manager are type-A personalities who want to be at work all the time. My dad was and is like that. He progressed much further in his career than he would have otherwise and our family was none-the-worse for it. Not everyone is like that, but I don't see it as incomprehensible (or even a problem).
Although I'm not the same as my dad, I've long felt an individualist stubbornness that leads me to a similar conclusions. When I was a kid, we had a birthday party at a bowling alley and the attendants put the bumpers[1] up in our alley and wouldn't take them down. I was so incensed that I instead made a game of trying to whack the bowling ball hard enough against the bumpers to bounce over them. I was elated when I got one all the way into the next alley.
My gut reacts to the idea of "mandatory days off" in an intuitively similar way, even though I probably wouldn't be incensed about it the way I was about the bumpers in the bowling alley as a child. I'm probably on the extreme end of a cultural and value difference between Americans and Europeans.
> So that the employer will see him more favorably than the other employees at the same level when making decisions in which all other things are equal.
There's a bit of that. The main reason though is that I am way out of touch and unable to separate work/whatever life for a bunch of different reasons. Let's say I am a mess right now and not caring much about losing vacation.
> From the candor of GP's comment, I would venture to guess that both he and the manager are type-A personalities who want to be at work all the time. My dad was and is like that. He progressed much further in his career than he would have otherwise and our family was none-the-worse for it. Not everyone is like that, but I don't see it as incomprehensible (or even a problem).
Not really, maybe. I am a teamplayer and a people pleaser but I have some type A tendencies (types only tell a part of the story anyway). I have nothing to show for that though (not a top leet coder, not a top lead manager, etc. I am good, reliable but I am not shining).
I think if I was more "type A" I would not let such things happen.