They've made a trillion dollar business out of small, high-margin electronics that consumers replace every couple year. Most of their products serve to enhance this business model or have high complementarity from a technology standpoint. The self-driving car project feels like an incredibly expensive diversion from this core business with limited technological overlap to their existing product lines. I'm trying not to see this as "Post-Jobs Apple finally jumps the shark," but I'm just not getting what the vision here is.
This isn't snark, by the way - I'd really love to hear a good model for what they're doing.