DMCA. Breaking even the shittiest DRM is illegal. This of course kills incentives to break DRM from the commercial side as nobody can make any money off it without getting sued. Otherwise I imagine some 3rd party part manufacturer would attempt it.
All of this decrease the useful lifetime of equipment.
And no, all of this is not required, a trucked was able to pass California regulations with an old pre-EPA-regulations diesel engine, but the tolerances are a lot tighter (ie. forget about that chinesium oil pump with a couple thousands too much shaft end play), maintenance is a lot trickier...