They have not over-engineered anything in this case - they have deliberately taken user-hostile actions, going out of the way to prevent repair, and turn cheap repairs into very expensive ones.
- They welded the case: even the engine block that experiences combustion pressures and temps is just bolted together - why?
- They even outdid (pre-R2R) Apple in every aspect - proprietary components, everything put together on the same PCB, with third party replacements impossible, replacement parts locked out cryptographically, and 'anti-theft' (anti-repair) systems installed so even authorized dealers are at a risk of bricking the vehicle - and third party shops can't even repair it.
- They are German so in the EU they are above the law (or more accurately they write the law) - but it'd be nice if us Europeans had their own Louis Rossmans and actionable right to repair laws, and the EU did something beyond bullying foreign tech companies, and applied the same level of scrutiny to domestic ones as well.
This is a comical level of evil - they know that due to the proprietary components (that you can't get at an auto parts store), when these vehicles become 10-15 years old, they will be either uneconomical to repair, with repair costs exceeding the value of the vehicle, no third party parts, no possibility of third-party service - people will resort to stealing these cars to source replacement parts.
So they installed a system that bricks the vehicle should it detect tampering - which might happen if somebody tries to fix their own vehicles.
And let me reiterate, Germans are above the law in the EU - the only reason Dieselgate became a huge scandal is that the US found out about it - please, American friends, could you do another 'gate' about this - its for the good of all.