I completely disagree, we've made more progress in the last 40 years than in all of human history. We can sequence an individual humans genome, that's just one example. This is true for nearly all of Medicine. Your way off here.
I was specifically pointing to mental health (where we still don't have a well defined list of diseases) and neurology (where we have made no actual progress on any of the major diseases). You're right for medicine and human biology more widely
But just our understanding of mental health as it relates to genetics. We now have genetic markers for all sorts of mental health disorders. That alone has changed the landscape significantly.
In neurological stuff just look at the neurostim world, big stuff there, acknowledged that it's not strictly mental health but you mentioned neurological stuff.
The problem is, none of that has lead to any actual treatments. It's sort of nice to know that gene 1 leads to depression at x% rate. Or gene 2 means people get dementia sooner. But until there is a pill to prevent or treat that we are no where. Until then, you need to do more, not less experimentation.
I guess this is the difference between scientific progress and medical progress. We have made very little of the latter in these fields.
True, we haven't yet cured dementia. But we currently have the best standard of care for mental health in all of human history:
"The best treatments for serious mental illnesses today are highly effective; between 70 and 90 percent of individuals have a significant reduction of symptoms and improved quality of life with a combination of pharmacological and psychosocial treatments and supports."