How does the Mac have extremely strong vendor lock-in?
Sure, you can use the App Store and use all the stuff that integrates with iPhone, iCloud, etc
But you can also just treat it as Linux for Laptops (that actually works), and roll with all the standard open source tools.
Apple is also iOS
I don't disagree with you, but technically speaking MacOS is still proprietary and Asahi is not compatible with the latest and greatest Apple devices.
While they don't _prevent_ Asahi from doing what they're doing, they certainly don't go out of their way to make it easy for them.