I disagree.

Downs syndrome, autism, MND, chronic asthma, congenital heart defects etc etc - debilitating conditions that - if humans were still a 'wild' species, would be quickly dumped out of the gene pool simply because those conditions would not be survivable.

Nowadays, not only are they survivable, they are also survivable to a point whereby people with those conditions can have children, passing those conditions on.

How many people would be dead within 12 months, if all modern medicine ceased to exist?

How many medical condition defining genes are getting passed on that would, without modern civilisation, die out?

My opinion is that much the human gene pool is not evolving. Its not even stopped. We've beaten natural selection. It's going backwards. I don't think observational bias can explain the rise in these conditions, nor do I think modern impacts such as particulate pollutants, second hand smoke etc etc, are to blame.

Natural selection no longer applies, as nature has nothing to do with us anymore. We've beaten it.