> What if the wheelchair malfunctions and injures someone else? What if my car malfunctions and causes an accident?
Yes, what if it does? Unfortunately getting FDA approval isn't going to do anything to prevent that. I fully acknowledge that regulatory bodies are good for dealing with externalities, but consumer protections do not fall under that category.
> Also, I don't want to live in world of frauds and scams and other crimes, trying to navigate it, for obvious reasons
Then, as I said, just stick with the FDA approved products. Government standards would still exist, you'd just have the option to purchase things that didn't meet those standards. The freedom to color outside the lines includes the freedom to color within them. You're not harmed by other people choosing differently.
> It's also an economic disaster.
Citation needed. Typically heavily regulated economies fare worse than those where competition is permitted.
> You're doing an awful lot of work to empower already powerful people by removing democratic power over our society.
We clearly have very different ideas about who holds power in our society.