Easy availability of components doesn't necessarily mean that you will work on he car yourself. It mostly means any workshop can work on your car and it doesn't cost a fortune. Easy access to parts from multiple manufacturers means you are not stuck waiting for parts from a single manufacturer. It also means that there can be competition to deliver the part at a reasonable price. And quite possibly, that you can get upgraded parts if you are willing to pay a premium.

This is essentially what the right to repair movement is pushing for laptops, phones and whatnot. Access to replacement parts for phones and laptops aren't necessarily so you can do the work yourself. It doesn't mean that your grandmother will be replacing BGA components on your laptop. But it does mean that you can go to anyone sufficiently competent to carry out the work and get it done.

And as with computers that were not built for easy upgrading and/or repair: a lot of modern cars suffer from the same problem. And often for the same reason: they want you do spend more money buying a new computer/car or have their clueless service reps tell you that you need to spend money on unnecessary parts because they can't or won't repair them.

Righ now both me and a friend of mine are waiting for components to arrive for our respective cars so the workshop can get around to replacing them. I've been waiting for parts to arrive since the start of december. He has been waiting for almost half a year for to arrive from the factory. The manufacturer can get away with shitty service because there's really only one place to get the parts.

I'd much rather own a car where I can get the parts within 24 hours and I can either get a mechanic to fix it for me, or, if the job doesn't require a lot of custom equipment (which I'm not allowed to buy) and know-how, do it myself.

You sound like you haven't actually given this any thought, so you should ask yourself why you felt compelled to "contribute".