Comment by happymellon

Because profiles are a different thing and are a state of your browser.

Container tabs are the state of your browsing session.

Yes, a different browser provides you with a different session, but its overkill.

Scenario: I deal with multiple AWS accounts, which require me to log in to each one with SSO. Container tabs allow me to access each one as different colour coded tabs at the same time without being kicked out when it overwrites my session.

Second scenario: I have multiple clients, I would use different profiles to separate out plugins for password management requirements, different bookmarks, etc.

There are a disappointing number of sites that are stateful, like Service Now and container tabs make them bearable.