It depends. There are rumors that allegies of our days are caused by exaggerated hygiene.

You have to wait of few hundred years to see all the consequences of technology in retrospect.

There are rumors that the lack of infectious disease in modern society is also caused by exaggerated hygiene.

There are rumors the current lack of infectious disease is really just an intensely selective breeding ground for much more effective infectious disease.

no this is a fact

Depends. People smell better though, but then we were probably desensitized to that before anyways.