I agree with you except for a few points. There are concrete and asphalt (I suppose you mean what we call tar roads in India) in villages in India. 50-100 years

I agree with you except for a few points. There are concrete and asphalt (I suppose you mean what we call tar roads in India) in villages in India. 50-100 years ago there might not have been, but modernization (of some things) has happened, and we have that now - some. Also glass at least, if not nails, can occur at a non-trivial level, due to littering. I see it a fair amount.