At some point this is just a debate about vertical integration. Apple can deliver better experiences with it, but of course it limits user choice.
Many people want fully modular, open systems, which is lowest common denominator.
I can see both sides of the argument, but I am so skeptical of regulators deciding what can be integrated or not. If modularity is better for consumers, why don’t they prefer modular systems?
At the very least I think there should be a very clear tradeoff; right now the EU seems to think they can regulate their way to all of the benefits of vertical integration while outlawing vertical integration. I don’t see how anyone could look at that with a straight face.