I've worked with software engineers working on the CAN bus, and I had the same questions as you. According to them it has to do with the amount of cabling needed as well as electrical interference. A car has a lot of cabling going all over (a couple of hundred meters in total was the number I got), and if you can put as much of it as possible on the same bus(es), you save yourself a lot of problems.

So I suppose weight could be a factor, but space seems to be the big one.

Well the obvious solution it to go wireless! What could possibly go wrong?

It looks like a CAN bus hub weights about a pound. That's negligible, considering I have about twice that weight in garbage sitting in my cup holders.

[1]: https://www.autozone.com/electrical-and-lighting/can-bus-hub...

How much does death weigh?

-21 grams apparently /s

I mean "a lot" in computer terms is like 4 lbs of equipment but since the brake pads on a truck weigh in at more than that I assume its not weight related.

This begs the question: how do you know this is true?

Well JD Power listed Fords MyTouch as the biggest customer complaint of 2011[0].

I think customers might know how messed up their car is.

[0]https://wheels.blogs.nytimes.com/2011/06/23/aggravating-myfo...

My post makes no sense. I replied to the wrong parent