It's extremely relevant to flight changes which are both time-gated and (for most users) expensive. Having information out there like this is in the public's best interest because people shouldn't get stuck in a flight they're miserable in. If a dom team wants stuff like this not to be in the public eye, then they should work to improve the flight, which AA clearly mostly hasn't done.

(If flight changes could be done at any time and for free, then I'd agree it has no purpose being public, but well. That's not how FR is set up.)