Well, I'm saying "good riddance" on behalf of the chat leaving. Mainly because of one feature that has always irked me: The option to delete messages.
It clearly allows you to "delete" a message, but once you refresh the inbox, the person you chatted with automatically reappears at the top of the chat, it was the most annoying thing ever, even more annoying than getting writer's block, if I'm honest ☠️