Yeah the information has been available for awhile. What stops people is all the indoctrination and conditioning.
"I'm not allowed to replace my water heater, the government says I need permits, the government says only a plumber can connect a gas line"
I don't think people realize that the people doing entry level skilled work like replacing your water heater or swapping your brakes at jiffy lube often only exceed the caliber of labor that's in a McDonalds when it comes to attendance and pissing clean.
Some stuff you really shouldn’t do just because you saw some youtube videos, and it has fuck-all to do with “government indoctrination.”
I grew up in trades. I’ve seen shit work and dangerous work and serviceable work and beautiful work. And sometimes even I didn’t actually know the difference until an inspector (and family member) explained it.
So I do small stuff. If it’s serious and I can afford it, I use a trusted professional.