I'm European, personally nobody I know uses iMessage or FaceTime, even people who only own Apple devices, WhatsApp is the norm, you're almost forced to use WhatsApp, so I don't really care about that
As for USB-C yes, it would be nice to have one standard, use USB-C instead of Lightning, but it doesn't bother me that much, what bothers me is that iPhones are sold without a charging brick, but one could argue that if you can afford an iPhone you can afford a charging brick.
One thing that worries me are third party app stores, because I'm afraid companies might require users to download their apps only from a different store; I know this doesn't happen on Android, but Android isn't actively trying to prevent tracking, so companies might require users to use a different store in order to circumvent Apple's tracking prevention - if that is even technologically feasible, I don't know -.
Side loading doesn't worry me, users should practice their due diligence and educate themselves on what they're installing on their devices, if people brick their phones or computers, or get bombarded by ads, because they keep installing crap is, quite frankly, not my problem, as long as this doesn't create a problem for other users that spend more than 30 seconds researching an app, if this behavior is not going to lower the security of my software, then let them ruin their devices, I don't care.
Regarding offering a different in-app purchase options, I can agree on principle that developers should be allowed to inform users that is possible to use a different payment method - eg. subscribe using our website rather than the App Store -; but I also think that companies that created a technology, an environment, that allows you to reach a wider audience, deserve to take a cut on purchases made through their systems, be said companies Apple, Google, Microsoft, Sony, Amazon, etc...
I can agree that had Apple been a European corporation, the EU wouldn't have cared this much about their practices.