Yep, I've seen them, and Teslas are better than a couple of other brands I've looked at (but I've not looked at every brand). The car provides diagnostic details in English (see Service Mode). Is it perfect, no, but far better than just about any other vehicle make. Tesla doesn't force you to buy an expensive scan tool as other automakers do that just gives you a mystery number for faults. Here's one example from Tesla service mode:
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All cars and brands require some smarts and training to do repair jobs. I realize not every problem will generate a diagnostic flag, but those that do not are typically more common issues that happen on all cars (tires, brakes, suspension, steering, etc.). Those knowledgeable in those areas should be able to diagnose and fix them as they are similar for all vehicle brands.