[Solved] How good is the user isolation in macOS?

Jonah Asks: How good is the user isolation in macOS?
Recently I bought the MacBook Air M1. I have created two accounts. Laptop will be used by two different persons. Both users have administrative permissions.

I have been wondering if that setup will provide privacy.

  1. Is it possible that another user can easily read the files from the other user?
  2. Does the user have an access to iCloud files?
  3. What about bookmarks and tabs from Safari?

Is there a list of areas that are compromised with usage of root rights?

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