Most Recent Posts at the Bottom?
I cannot think of a single application that does this. Overall it is a terrible design. People read from top to bottom and left to right and that comes natural to people. Reversing this makes the application seem clunky and awkward. Its hard to get buy in from my team because of this.
Sean Ellis commented
This should be an option.
This how Slack, Hipchat, Discord, Whatsapp, text messaging, and every other messaging system works. I doubt your team doesnt buy into it because of this.