We are different. For me it's exactly the "oh you changed it, never mind, I'll use it a bit differently from now on" situation.
Slack's good at engineering and development. They used to be good at UI/UX, but whoever over there in the text entry product design slot is having a case of the Jony Ives.
>When typing code with ```, Enter should not send the message.
>With this checked use ShiftEnter to send.
So they didn't really provide anything new here, just changed the default behavior.
edit: formatting