> Sick days, vacation, and parental leave are also good examples at a small scale. It definitely doesn't hold for every jobs, but if a person can be out of the job for days or weeks without a huge impact on the team it may very well be a mostly bullshit job.

I don't see how this idea holds up to scrutiny. People who do actual work need time off regularly to keep concentration and motivation up, especially over long periods of time. These factors don't matter for bullshit jobs - who's gonna notice if their output is reduced?

The impact of time off is instead directly related to quality of management. People will need time off for various reasons. You can either work together and plan around this, or you can act like it's not the case and have a) less chance of properly planning, b) greater risk of the full team being affected (e.g. when sick colleagues come into work), and c) less happy workers with higher turnover.