This is not a deal breaker, it’s just sending/sharing only topic ID without copying/pasting long urls and etc. People can just paste the ID in the field that I have attached and go to the topic/post. Look at this as just another method to access the topic but in a bit geekier way. Besides, /t/19084 pattern could be a unique cultural identifier of Discourse in certain communities.
I know, I want just an easier way of this :D. typing topic/post ID vs typing yourdomain.com/t/ID