And the Health app and parts of Apple Pay and all the Apple Watch support stuff.
This one boggles my mind. I probably wouldn't need it often, but there are some times where I wish I had it handy instead of needing to pick up my phone. (And without needing to install a 3rd party app.)
You can type equations into the search field and it will give you the answer.
Couldn't you do that on a phone, also?
1 - Hit [command] + [spacebar]
2 - Type in your math problem.
Similar to google search in capability as far as I've seen.
This blew my mind when I realized it. I spent a solid like 10 minutes looking through the AppStore and my folders for the original. Why???