Freenixi you're thinking about a link you can share outside of Flarum ?
If it's from inside a Flarum extension you can programmatically get the last number.
One solution might be to use a ridiculously high number at the end of the url, and it should automatically scroll to the bottom, like https://discuss.flarum.org/d/17745-flarum-0-1-0-beta-8-released/99999 , but this doesn't seem to work that well. Not sure how the internal logic is.
/latest could be a nice addition to the Flagrow Direct Links extension.