Do you ever get frustrated because you are trying to use a couple different Google accounts at the same time? You have work Gmail open in one tab, and personal Gmail open in another. When you click on an attached document in one email account, the document opens in the other account- saying you don’t have access.
Or perhaps your family shares a computer, and it gets a bit confusing when each person opens their Gmail in a new tab. The browser will just assume the most recently logged in one is the active one, so even if you come back to your own Gmail tab after your daughter has been emailing her friends, the browser will think you are her.
There’s a clean, easy way to manage using different accounts. And you can be logged into and using all of them at the same time, without the wrong document trying to open with the wrong account, or the wrong YouTube profile appearing.