An example use case would be someone who wants to hide their history, and closes their tabs frequently, but doesn’t want to sign in when opening them again.
I like private mode, but it doesn’t save cookies. It’s annoying to sign in every time just so the browser doesn’t save history. My preferred implementation would be per-site just like DuckDuckGo’s fireproof sites. (Those sites don’t clear their data when closed) If it were implemented per site, the toggle could be called “keep site data” and be placed in a website’s settings page.
The only reason I asked for it as a global toggle is because it would be easier to implement. Private mode with cookie persistence is the same as normal mode with no history, if that makes sense.
I want cookies kept, but history discarded. The implementation doesn’t matter IMO.