You cite a bunch of changes, but none of them are what people have actually been claiming for the past 19 that Apple will do: preventing us from installing arbitrary software on our Macs.
I still have my MacPorts installation, which works fine, and installs all kinds of command-line tools.
I can still write anything I want on my Mac, compile or interpret it, and run it.
I can still install whatever I want from outside the Mac App Store.
You cite a bunch of changes, but none of them are what people have actually been claiming for the past 19 that Apple will do: preventing us from installing arbitrary software on our Macs.
I still have my MacPorts installation, which works fine, and installs all kinds of command-line tools.
I can still write anything I want on my Mac, compile or interpret it, and run it.
I can still install whatever I want from outside the Mac App Store.
This is a classic example of goalpost-moving.