Yep. Specifically, the temporary containers keep me there for web dev stuff. People will always recommend profiles in chrome, but that can't replace a single hotkey to spawn a temporary throwaway container.
>>adastr+zu
I can have 3+ different temporary containers open at once, each with a distinct set of cookies, whereas private browsing gives me only one extra cookie jar.
It's massively helpful for testing interactions between users.
>>lolind+Yz
To be a little more explicit, I think you need to spawn a private window from a non-private window to get a new environment. If you do it from another private window it uses the same sandbox.