There's no reason to believe that we'd be more efficient if we worked less. People working part-time don't become more efficient, they just work less.

Which is understandable, and that choice should be theirs to make -- if they accept that it has a direct impact on everything they get, and don't rely on others working more to compensate for them working less.

Only if we keep everything the same. Then yes, you’re right.

Surely you have more imagination than that.