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Cars are a terrible industry to get into. Building cars is massively capital and plant intensive, heavily dependent on supply chain logistics, and the market is already extremely competitive. The entire industry is well on its way to switching to electric and/or self-driving. Selling cars requires a huge dealer network rollout with huge up-front costs for training and spares. Doing it DIY would be insanely expensive,…
Pretty much everything you just said could have car replaced by the word phone, and you'd sound just like MS BB or Nokia in 2007. "Clever internals but crappy ux" describes pretty much every car ever. Regarding dealerships, ever heard of Tesla? It's definitely possible to diy, and Tesla has nothing compared to Apple's resources.
Tesla is trying this model, but I don't know whether anyone can makes claims as to its success yet. Right now they're pretty low volume and are losing lots of money. Maybe the no dealer model scales, maybe it doesn't.