Local user System. Why (and does he need) full NTFS rights to user folders?

Question

NTFS

Colleagues, good day!
I'm tidying up the rights on the user's balls and noticed that among the "necessary" rights, many folders with documents have the rights of the local user SYSTEM.
I can not find information why this user has rights to folders and what he does with them.
I'm assuming this is done for processes running on behalf of a given user, but I don't have any that would have to touch user files.
Help to understand please.

Answer 1

that this is done for processes running on behalf of the given user

Well, that's what all users are created for. Simply because it is not the user who works on the computer, but the programs. The user is an abstraction that facilitates the regulation of rights and the work of several people at one computer.
Many services and tasks from the scheduler run on behalf of SYSTEM. In the user profile directory, you should not delete SYSTEM where it is by default. In directories that you create yourself outside the profile, you can adjust the rights as you like.

Answer 2

In short, almost all services run on behalf of this user. A service is a program that runs in the background. As a rule, they service your computer so that it feels good and can do what it can. In recent versions of Windows, a list of existing services can be viewed on the "Services" tab. You can see which services are responsible for what. System has almost limitless power over the computer. And if you start restricting these rights, then Windows will get worse.