Sure, I can agree that division of labor is crucial. But I work in a factory where what I suggest is somewhat of a reality. Cross training is a purposeful practice because it creates a more flexible/robust workforce. Jobs that are the worst to work are typically shared amongst a large number of people so that nobody has to do it all day, which promotes worker wellness and thereby efficiency. Ergonomic and safety concerns are addressed so that workers stay healthy and can work more efficiently.

The place I work is a B corp.

Your implied stance that people should only do one thing ever doesn't make sense to me. For the more specialized roles at my facility that are potentially odious, they generally have a much easier workload, and they aren't doing only that one task anywhere close to all day most days.

So let's not say that people should give up on making factories places where workers can be happy. You can have efficient workers who know how to do more than one thing.