Please have a look at how indigenous tribes live and cure the sick to get a feeling what it would have might be back 50k+ years.
What I got during Museum visits and talking with people working in academics those people had a pretty good living. Well feed and even major injuries were treated well.
So please come on.
This is contradicted by any and all documentation on not only "indigenous tribes", but even developed countries until the age of antibiotics. Injuries were much riskier in the past than now, and no idyllic Shangri-La you fantasize about had any magic to avoid that. The food precarity of hunter-gatherer lifestyles is why so many societies adopted agriculture. Plus, infant mortality was through the roof, and risk to also mothers was high. I think you took from "Museum visits and talking with people working in academics [sic]" a misunderstanding that you wanted to hear.
That our species survived down the millennia does not mean they had maximized health, just as we today have not maximized health. But we have made greater strides in childhood IQ-relevant areas.
We know that good nutrition during childhood has a significant impact on IQ, as does avoiding parasite infections. Those ancients were the same species as us, but it is almost know that that they likely suffered from food precarity at times and endemic infections, so the belief they had their shit less together than many modern populations is reasonable.