What is the purpose setting apple ID in Users and Groups?

What is the purpose of setting the apple ID in Users and Groups preference pane of System Preferences?  Is it really necessary?  All of apples services can still be used without setting an apple ID (like iCloud, iMessages, FaceTime, iTunes, etc...).   I am sure apple has a reason for it just would like to know what it is.  Anyone have an idea?   Thanks for the help.

ya, I knew about that but I think it also has something else to do with screen sharing, file sharing and back-to-my-mac.   Thank you for the help.

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