1) Before the demo even starts: all Apple apps, pro or casual? Already running. Microsoft Office? Already running. Adobe Creative Cloud? Already running. That's the vast majority of the Mac userbase right there.
2) No apparent hard cuts on the legacy. I was expecting them to not support x86 backwards compatibility if they could get away with it, but apparently they're committed. Even naming the technologies "Universal Binaries 2" "Rosetta 2" is a confident been-there-done-that-will-do-it-again presentation. Unlike last time around, there also doesn't seem to be a major removal of macOS APIs?
3) Acknowledging what kind of x86 stuff machines are used for by showing VMs right away, and (trying to?) show Docker right away. Is that the first Linux demo in an Apple keynote presentation? It was a Linux desktop environment, even.
Now it seems this ARM announcement was a bit rushed by design, flashing by the features without allowing a substantial look. So it's likely we're going to be dissappointed by x86 performance and having to say good bye to APIs (this for sure is the end of OpenGL right? edit: no [1]), but they do leave an impression of having their priorities of broad software support straight and a pretty seamless transition as far as you can get one.
[1]: https://developer.apple.com/documentation/xcode/porting_your...