At least in places with strong consumer rights I imagine there could be regulation to force vendors keeping their old cars repairable.

This could be but in practice it doesn't work.

Both the governments and the manufacturer benefit from you driving a newer vehicle instead of keeping your old car running. Topics like environmental impact safety etc. are higher priority compared to repair-ability. Additionally most people don't care.

Additionally there is the issue of licensing and regulation around the hardware and software of a vehicle. The regulation in my country is written around "type approval" and this means you can not change the car significantly beyond what is approved during the car "type approval" process.

On top of that this market is ripe for abuse of planned obsolescence as the product is very technically complex and there is no real regulation against it.

This is why I drive an old car and a simple modern car, most modern smart tv's with wheels strapped to them will become bricked the moment the manufacturer doesn't support them anymore (after the 10year lifespan).

>>I imagine there could be regulation to force vendors keeping their old cars repairable.

Yes, but what does that mean in practice? That Manufacturer has to keep making parts for 20 years after production ends? How does that help if your entire infotainment system runs on Google's AOSS system and google just pulls the plug on it or the built-in modem stops connecting to the internet because your country decided to switch off all 3G networks(which is a real problem happening everywhere). Is the car "working" but with all apps and satnav completely blank still functional or does it need "repair" - if so, what does that repair even look like?

As a basic example - I have a 2020 Volvo XC60 with Sensus OS - all the maps are preloaded on the internal drive and they will continue working until the hardware breaks - they might get outdated but they will work. But I drove a new Volvo XC60 with AOSS and I was in the area without any signal coverage - in that case all the maps were just blank, the middle of the driver display was blank, it literally looked broken because nothing would load and the screens didn't have a good fallback for such a scenario.....which will inevitably happen to all these cars, either because they lose connectivity or because google/volvo decide to stop supporting them on their network.