To expand on your towbar analogy, consider this:
- The towbars wouldn't be fitted with the fixing holes in the same place for cars manufactured in different countries because the fixing holes are mandated by the local governments, although there's a fair amount of standardisation been attempted
- The towbars could be made of cheese and you would be able to fit it to your car, but only when you tried to use it would you realise why you needed a steel one
- Towbars in themselves and the towing of cars is quite a good analogy. Your stance is that anyone should be able to fit one themselves and tow anything without referring to a specialist, yet:
Towbar Legislation Car Tow Bars Regulations Law Commercial Standards shows the laws surrounding towing.
The bottom line is, that if everything in IT was a simple as towbars then IT support wouldn't exist. It isn't, so we do. Wifi is a munge of international standards, drivers written to a price by whomever the supplier can get that's cheapest, all sitting on top of something that needs to work cross-platform to a 1960s design whilst providing adequate protection from automated and highly targetted attacks from those who are less scrupulous than most you find on PPRuNe.
I think a fairer way of saying it would be: "If nobody wanted to hack you, we'd be able to make systems which worked a lot more of the time"