It's 5 minutes from your Garrison - Ashran - Portal to Vol'mar - 1-2 minute walk to HFC itself.
Christ, you're the kind of player that AFKs for 10 minutes while the rest of the raid clears trash and calls for a summon although you could've been there and cleared in the time it takes to walk. You could circumvent the path to BRF by taking the mole machine in your garrison too and take a 3 minute flightpath.
You can use your flying mounts without pathfinder, but on the ground. I'd agree if it was back in MoP and almost all flying mounts had no ground animations.
For raiders, there is absolutely no need for flying. The shitty players who always calls for summon and refuse to go to the entrance still won't be going to the entrance, flying or not.