This is very exciting, but it seems it's just building in partial uMatrix functionality. It's really becoming a pain to have so many overlapping tools doing the same thing.
Default settings can move the industry in a way that opt-in things like uMatrix generally don't.
(Disclosure: I work on ads at Google)
My biggest disappointment is that this doesn't do anything new. My secondary disappointment is that this will make my life a little harder when I can't get a website to work. I hope you're right that this means I eventually won't need to install a plugin for uMatrix functionality.