No clue and it's entirely possible diagnostics have improved in some ways, in part due to improvements in testing and in part due to patients being better educated.

But I'm old-ish and I remember when it was pretty normal for Mom to show up with all three kids and a couple of their cousins and get them all treated at the same time. In contrast, in recent years, I routinely hear that people in the family pass the same crud around repeatedly because they get treated as individuals and it leads to recurrent or chronic issues. I've also dealt enough with chronic health stuff that I'm quite confident that when doctors decide "This is your normal. Just get used to it." it becomes self-fulfilling prophecy.

From what I gather, obesity and chronic health issues are vastly more common than they used to be. To my mind, that's probably evidence that something has gone very wrong with our health mental models/practices overall and the change in how we interact with physicians is probably just one grain of sand in a beach of changes. (However, it will also be confounded by medical advances leading to people malingering when, historically, they would have simply died. We often can't cure them, but we can keep them alive longer than we used to.)

But I'm sure that's a case of "Other people won't necessarily see what I see and if they don't, there will be no winning them over." (shrug)