Same in Europe and still completely besides the point.
Also, this argument keeps ignoring that the ominous "anybody" is required to have access to a repair shop, tools, and the skills required.
Once you take into account all these factors it quickly becomes apparent that not "anybody" will repair cars, appliances, and electronics by themselves; regardless of legislation.
The people who do care (farmers in the US, electronics repair shops, that dude on YT who repairs Teslas, ...) incidentally are the ones with the skills, the tools, and the incentive.
The licensed part comes into play as soon damage regulation due to improper use/repair occurs. This isn't a concern for private individuals (in the car example: there's a mandatory in-depth technical inspection every other year in Europe, so an improper repair results in a failed inspection anyway), though your insurance may become null and void depending on the circumstances.