We also lacked indoor plumbing, sanitation, sewage management, and typically had livestock near people as there were no highways or 18-wheelers to deliver meat from a farm in another region.

Life was stanky for thousands of years.

They’re called comforters and very common in many places. I rarely see duvets where I live. You just wash them periodically like anything else.

Bed bugs need to be introduced to the home from a source somewhere and a duvet cover won’t help if they are.

I’m an uncultured slob that doesn’t put my blankets in giant pillowcases. I am happy in my ignorance.