Should I Install macOS Sierra?

What happens when you install macOS Sierra?

Besides eschewing the OS X moniker, Sierra finally brings Siri to the Mac, alongside picture-in-picture, updated Photos app, Apple Pay in Safari and the ability to unlock your computer with an Apple Watch. It’s a feature rich update, and you’ll want to get it on your Mac.

Does installing macOS Sierra delete everything?

Don’t worry; it won’t affect your files, data, apps, user settings, etc. Only a fresh copy of macOS High Sierra will be installed on your Mac again. … A clean install will delete everything associated with your profile, all your files, and documents, while the reinstall will not.