This doesn't exist now for the same reasons it probably wouldn't work in the future: You can save significant amounts of money if you cut the pieces out of the "standard" that you don't actually need. Chips are cheap to make, in bulk. It's almost entirely a fixed cost/area. That's the magic. So, it's almost always cheaper to make a custom chip than to pay for some bloated standard containing large sections that will never see power, especially when chips are something like 40% of the BOM, for modern cars.