Trust in certified authority is dead. The highest paid, most specially certified individual deserves the same suspicion as the guy giving free candy from the back of his van. That's not to say your best friend can't be a candy maker who just drove by, or to say a diploma can't accurately reflect specialized learning. But you need more than just a piece of paper.
.. . this is all a matter of building trust in an individual after trust has been shattered for decades across so many industries and disciplines.
Oh man, there are so many directions to take this... While some experts in certain fields have "failed" the public, there is quite a bit of misinformation that has poisoned the well from which experts speak. The growing anti-science trend out there is, imo, dangerous. Yes, scientists make mistakes. Yes, sometimes there are those who deceive for personal gain. The majority, however, are not doing that. Studies get misrepresented by the media, and misrepresented by trainers (certified or not) in their own corner of media as well. What we need is accountability for those who fail to acknowledge mistakes or deception, and from the other side, the willingness to accept that "certified authority" is not, and should not claim to be, infallible. Good scientific professionals do not make absolute statements. They make statements about "support (or not) of [x]," not "proof of [x]." The layperson wants a black and white, yes/no answer. The layperson needs to be better at accepting there is almost always no such thing.
This is its own can of worms, but there are a lot of voices out there (in many fields of life) who are not trained in the fields about which they make commentary on, who make a lot of noise. Just like we want trainers who can produce results, we should want the voices influencing the public to be versed in actual, real-world outcomes. Sadly, this is often isn't the case.
If you have plumbing issues, you call a plumber, not an electrician who knows a plumber. If you want to be a strong powerlifter, you hire a PL coach, not a gymnastic coach who has dabbled in deadlifting. If you are experiencing mental health issues, you see a therapist (sorry, not sorry; the gym is not therapy). It should be the same whenever you seek information about the world.
Speaking to the fitness and health space, there is also a growing trend of doubt in public experts. But it's not black and white. Some long-standing experts are refusing to acknowledge new research and new approaches. On the other side, the "non-certified" sometimes need to listen more to what researchers are saying.
It's not black and white.
I think it's fairly obvious that the only real metric we have when it comes to evaluating coaches is the results. Who have they trained? Where did they get? Where did they start from? How hard was it for them?
I think the elephant in the room is that trainers must start somewhere. As much as we all would like trainers who produce results, sometimes we have to acknowledge that new trainers must get their experience from somewhere. Just like in my above statements, I think the trainers and trainees have to meet each other in the middle. Communication skills and developing good relationships with clients are important.
Well… as
@Steve Freides has sometimes quipped….
“What do you call a person that graduated in last place in medical school…? doctor.”
You know, I don't quite know what to make of that statement anymore. I can't tell if it's a jab at those who didn't do as well, or an acknowledgement that even being last in a tough program still means you made it through a tough program. I am getting into junior/senior level physics courses, and I struggle a lot, despite putting in dawn-to-dusk work efforts most days of the week. When I talk to engineering students, they have a tough time grasping things that I consider basic. To be fair, I would have a tough time grasping some things they consider basic!
The person who graduated last in med school still knows FAR more than someone who doesn't. They also put in a lot more effort than those who didn't. The above statement kind of makes it sound like the person graduating last was lazy or incompetent, but you don't get into med school, and stay all the way through graduation, by being incompetent and lazy.