You’re right about the description of the work organization. And now? We’re fighting to change these things but in the meantime? Class solidarity is not just words: it’s accepting to make sacrifices for others who need something more than me.

And even in a perfect world where the employers would willing to hire more people, or if the firms were socially owned, things wouldn’t be perfect. Some jobs are in tension: not enough candidates. Some times a big part of the workforce, no just one coworker, want to leave at the same time. Epidemics will still occur. School holidays will still be at the same periods for everyone. Even in a socialist utopia, there would be schedule conflicts (far less than today, but still).

We should in this matter like in the others apply the old principle: from each according to his ability, to each according to his needs. Parents will always have more needs than childless people, because they are themselves needed, and the mode of production will not change that.

(Of course, it also applies to people having a relative suffering from a chronic or debilitating illness.)