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???
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.