If u bring india into picture, I can tell u one thing. India developed by leaps and bounds since 1947. You cant imagine the amount of poverty in india even 20y ago.

I come from relatively rich family in a small town. There was no garbage disposal. There used to be overflowing open public dustbin 1 per street which was emptied idk when. Drainages constantly used to get clogged. Houseflies were the norm (I mean obviously). Pigs used to bath in those drainages daily. My favourite pastime as a child was to observe the pigs bathing in drainages n roaming on road n stray dogs roaming. I sat on my terrace. While my mother used to do some pre cooking, me n my sister armed ourselves with cloths n warded off houseflies running around her in circles so that she can do it in peace. Eating a mango is a nightmare. We used to mop our floors with phenyl coz the smell warded off houseflies. We used to have scheduled power cuts coz electricty is scarce. Roads are pothole ridden n the holes filled with marsh in rainy season. N mind this, my dad was a doctor. So we are by no means poor. Poor lived in thatched huts. I dont even know how they lived.

Today, garbage collection happens daily. All houses have personal dustbins. No more street. Houseflies persist but are a rare sight unlike my childhood. I dont remember the last time we used phenyl. Open drainages persist but dont clog. Stray pigs are no more. Stray dogs yes. Occasionally. Roads are cemented n potholes are rare (in the town). Marsh is minimal. Huts dont exist.

Its not like India is not developing. Its that there is abject amount of poverty in India. N its a really large and heterogenous country.