Sweating won't be efficient in thick fur pad

This, indeed, is absolutely correct. And as it we're, being hyperactive during the day in the blazing heat of the sun would encourage heavy sweating - which would not sync well with thick mass of hair. Who knows, this could partly explain the reason people in this part of the world (Sub-Saharan Africa) are less hairy, compared to the people in the polar caps.

This makes me wonder how is medical technology like C section and use of antibiotics shaping us.

Remotely, we wouldn't have needed prophylaxis if we're majorly reliant on our immune system (like our ancestral grandpas) to ward off infections and stuffs. But with the advent of technology, we've shifted our reliance to antibiotics and prophylaxis. No wonder, even our immune system isn't as strong as it would have been suggested to be.

Well, I still believe that technology's main aim is to complement humankind; without recourse to the attendant negative effects.

Thanks for coming