Out of all things, one should take time to trust and verify about one's health and body. And at least some knowledge about car mechanics and home repair/contracting. The latter two are just a reality of life if you don't want to get scammed and/or have a really bad job done by contractors.
It's not really fair, but also we don't -make- time to understand our bodies. It's a total choice. Preventative care is so important, yet hardly anyone takes the time to do it, only going in once issues develop.
It's not about totally rejecting anything an expert says. It's more about trust, but verify, and take the lead yourself to be on top of things.
In my personal experience, I am the one who has had to try to figure out my diagnosis so far because my GP, Dermatologist, and Immunologist haven't been very helpful. Most of my sessions over the last year were about 10-15 minutes, I answer some questions, and here are some pills, come back in a month. There hasn't been much testing after the initial battery of tests in the first ~2 months. I'm the one who has had to take the lead and be aggressive about trying to figure out a diagnosis, and now, about getting a referral to a tertiary/quaternary center with better immunologist experts to hopefully figure out the cause of this damn thing.
It's not that I don't trust doctors- it's the opposite! But this whole situation has made me wary about blindly trusting anything or sticking to their timelines. My Immunologist emphatically stated that "it can't be gluten"- well guess what? So far, not eating gluten is appearing to help. It's only been ~1.5 weeks so we'll need to see. Of course I recognize that diagnosing skin issues/dermatitis is totally different than other types of issues.