Please, not even poor starving destitute people in 3rd world countries live in thatched huts anymore. Also antibiotics are not that expensive, especially if you buy them for "fish" and get them closer to production cost. You could sell some watermelons and afford antibiotics.

Upper middle class people in the UK live in traditional thatched cottages today - it's still a trade.

African traditional cattle herders are still a thing and they're still living in thatched huts with weave walls.

Elsewhere in Africa, Thatching is still an up market thing: https://www.africathatch.co.za/

Perhaps spend some time learning about the wider world before making such obviously incorrect sweeping generalisations?

I’m talking about how many people lived in the past

This kind of life was normal then and the same argument could be made of not needing much more. But many would not be content with it now