Invisible Mode in Chat/DMs (different from Focus)
Having the ability to appear offline (invisible) would be great.
Setting their status to offline would make it so the sender won't expect a response right away but they could still send as many messages as they need to without getting the auto-response from focus mode. The receiver also wouldn't feel pressured to respond right away.
It would also be a great alternative to having to close out of Flow completely. Just click a button and you'll look like you're offline to everyone else.
Yahoo has this feature and, in the past, our company did utilize it regularly.