Roger. Lots of the forum members have few tools and little knowledge of mechanical things. Probably more than 90% of the car drivers on the road have no idea how their car works.
The work you suggest is complex. I suspect you are looking at this from an engineers point of view.
For instance a couple of my intelligent friends, accountant/stock exchange members, wouldn't even be sure what end of a spanner to use. Like the majority of car owners they pay others to do the dirty work.--