Yes, it makes a substantial difference, particularly in child mortality.

Hans Rosling has been dead some years now, but used to do great talks going through the basic data and trends.

I'm not sure why you're adopting a tone of debate/rebuttal. Every problem you mention is something I think we should address exactly under what I said originally, whether its inequitable access to healthcare in the US, or straight up lack of modern facilities in low income nations.