A “new” i.e. “incompatible” feature on your brand new Macs: no more physical ESC key on the keyboard, to prevent your perfectly running software to do so. Adieu! VI!
A “new” i.e. “incompatible” power socket for your MacBook Pro, to force you to discharge your old charger.
A “new” i.e. “incompatible” file system on your Macs (APFS), to make your system interacting haphazardly with your files. 1
A “new” i.e. “incompatible” operating system (High Sierra) to not work properly with your currently running software (from Office, to Indesign and Illustrator.)
A “new” – guess what? yes, “incompatible” – HTML 5 API to allow DRMs enforced at user-agent level 2
There are now enough calves in the valley, and the time is right to move them to another barn, where they can stay calm and dumb, with nobody but the rancheros from Cupertino telling them what, how and when to do.
They finally got it.