I think that is a lazy business model, selling cars at a very low margin just so that you could make money by planned obsolescence and high cost replacement parts.

I would rather buy a car for more money that's engineered to the best possible attainable engineering perfection than one that is not.

Often, those more reliable cars are even cheaper and made in massive production. Given Teslas goal of accelerating the change to sustainable energy, it would be in their best interest to make the best possible and reliable car they could at the highest possible production numbers, instead of leaving a competitive advantage for toyota to take over reliable scalable production. Besides I would argue the purpose of the model 3 is a mass market vehicle that is really nice, and not just a niche "luxury" vehicle as is often implied.