The thing that EU regulators don't seem to get is that I (and many others) have knowingly and intentionally opted in to this walled garden. It's simple, it generally works, it's relatively secure, and I don't give a half a shit about the cost. I do not want or need competition to drive down the price because I do not care about the price. It's a luxury product.
If the end result of this regulation was better software, better hardware, and better co-design, then I'd be all for it, but this just isn't going to be the case. We're just going to end up wading through sea of shitty, malware-ridden third-party bullshit that provides near-zero benefit to mainline apple consumers.
At least as likely as a positive outcome is that the experience for mainline apple consumers will get worse because Apple will need to dedicate engineering resources to interoperability instead of feature development.