“...they’re not multitasking as well as they think.”
No one does, those who claim to multitask are just fooling themselves, what they are really doing is switching back and forth between two tasks and most don’t even do that well. You will never see a carpenter driving nails with one hand while cutting boards with the other. You won’t even see him pull another board into position with one hand while driving the last nail into a board with his other hand. I chuckle when I hear people bragging that they can multitask. The graveyards all have “multitaskers” in them, they are the people who thought they could text and drive because they can multitask. Most of those I have met who claim to multitask can’t even do one thing at a time well.
Physical labor, sure, multitasking is hard. Otherwise, not so much and the excuse of “can’t multitask well” is just that, an excuse for incompetence.