Option for all chats to be temporary by default

There’s currently a temporary chat feature. But what I’d like to have is for the temporary chat feature to be default.

There should be an option that inverts the current behavior, where all future chats start off as temporary by default, but then I can hit the toggle button in the top-right to mark it as permanent. Most of the time, my chats are just stupid things that aren’t worth keeping.

There’s another feature request to auto-delete chats after a certain time. I think that would also work for my purposes here, assuming it’s also something where the default is for all chats to auto-delete, and it’s not something I have to manually enable on a per-chat basis.