I think this proposal is actually a really great idea. When I have a programming problem, it's super easy to locate documentation, tutorials, or other information on a specific technology. But it's a huge ordeal to try to find a proportioning valve for my 1968 Ford Thunderbird or to try to find information on where I can find a used seat track for it.
1968 Thunderbirds are becoming pretty rare, but if you knew that the seat track from 1967-1978 Thunderbirds, Continentals, Galaxies, Falcons, etc all had a similar model seat track, then having that information documented somewhere would be extremely valuable, and it would be cool if the automotive portion of the Internet weren't so diluted that when I search for parts for this car I end up finding information on 1968 Mustangs or 1985 Thunderbirds, which have zero value to me in my search.
Lastly, Mechanics SE solves a completely different problem, which is in providing answers on how to actually solve mechanical problems with the vehicle.
Searching the Internet for automotive topics is the exact opposite of searching for programming tools, and I'd love to see that change.