But as cars became more reliable and complex, fewer and fewer now know how.
There is also DRM and other shenanigans going on.
For example, just to replace your brake pads - something that most everyone should be able to do - requires, on most average modern cars made in the last 2-3 years, a $1,000,000 piece of software with a $6,000/mo subscription package.
Why? Because until the vehicle manufacturer authorizes that brake pad replacement, that vehicle will refuse to even turn on, much less move. It needs to obtain cryptographically-signed approval from the manufacturer for the work that had been done to it in order for it to even turn over the engine.
Now your average car owner isn’t going to have these means, so everything gets pushed off to manufacturer-authorized repair depots, invariably car dealerships, where everything can be nickel-and-dimed to maximum revenue.
This lack of repairability is one of three major reasons why I will never personally own a vehicle manufactured after 2006.


I disagree with humans being the CNC machines. In both cases, humans instruct the technology to create the designs, but it is the machine which is digging into the product to create the visual patterns.