My experience is that, because of concerns around single-point supply chain failures, most good design operations try to use off-the-shelf components as much as

My experience is that, because of concerns around single-point supply chain failures, most good design operations try to use off-the-shelf components as much as possible, and only custom manufacture that which cannot be purchased externally and still achieve the desired performance. Fitment is one of the factors, but fitment is itself dictated by a lot of things (aesthetics, ergonomics, safety standards, etc etc) that factor into the overall design. One could argue that Lamborghini could just drop a Ford Triton V10 into the Huracan and call it a day (it would save tens of thousands of dollars per car), but would that allow the rest of the car to still look like it does? Perform like it does? Enshrining right-to-repair into law is, in my opinion, a pretty good way to make sure that field-repairability is factored into the design. But I don't think its productive to force manufacturers to use a particular design technique to achieve that requirement. That hobbles their ability to actually deliver on their design.