I just can't agree with this take. It sounds that simple, but it's not.
I happen to enjoy learning and fixing.
It would take me a long time to build that trust. Nobody cares about my things and my family's safety like I do.
Most people are a long way from making as much money as an expert would charge them.
In the last couple of years, I have had some terrible times when I call for help.
When the dealership is charging $200/hr to have a kid plug in the car and follow a flowchart, I'll just take a look myself.
Plus one time they left my fuel pump loose and I had to pay (in time and money) for an extra round trip with Uber, and the fuel it sprayed onto the road. They didn't fix the original problem, which cost me another round trip.
Another time, I had technicians (experts) out to look at my leaking hot water tank 4 times before they decided it was time to replace it. I wasted the time calling, babysitting, coordinating, figuring out how to shower without hot water, etc.
If this is the average "expert" count me out. I'll do it myself. Plus, throwing money at a problem isn't near as fun.