I'm personally happy to stay inside Apple's ecosystem, but believe that everyone should have the option to choose. This looks like good news, a step in the direction of being more in control of the devices we buy.
You do have the option to choose. You can buy any number of Android phones, or you can jailbreak an iPhone with custom software. Ultimately this will be bad for regular people, and good for crypto scammers, ad agencies, and companies that rely on hovering up personal data.
That's often not an option due to Apple's choices, but if Apple offered an official way to break out of the garden with your own iPhone then I think things wouldn't have gotten this far.