You’re right, it’s not desirable for people to be overworked or those who can work to not contribute. It’s also not desirable for any of these people to go hungry:
People who want to work, but can’t find jobs
People who do work but aren’t paid enough to cover essentials
People who can’t work
People
We’ve become incredibly efficient over the centuries, and we have enough for everybody to eat without overworking anyone. The issue is many people not receiving the full value of their work, while a much smaller group receive value far beyond what they contributed.