You said "the interior was designed by 6 year olds". That to me implies things like "no rhyme or reason", "not thought out", "features missing" etc etc. That's NOT the problem with the GM interiors. It is very well layed out, has pretty much feature parity with all the others, and is very easy to use.
What's missing from their interior is luxury. The 12 inch screen is luxurious compared to the 8 inch, but the 8 inch works just as well (actually it works better, IMHO). Their trailering and camera tech is unrivaled. They have HUD (no other truck does) etc. They do miss the panoramic sun roof, but again, that's more an element of luxury vs feature. Same with air ride; it's a more luxurious ride.
So I'm not really arguing against you, just suggesting that your "designed by 6 year olds" does not really describe the issue that well. I'll shut up now