Ah so you like walking slow? okay There's no reason not to unlock mounts- Once you do you can even ride your personal chocobo without having to carry that whistle around.

Now to one up you, i've done almost everything you've never bothered with and little of the things you listed after.

Unfortunately the sad reality is there aren't enough players to regularly support all of that content. Which is why they took the approach of periodically highlighting different contents with campaigns. That said I'd like to see some of hte things mentioned that have never had a campaign have one with some kind of cool prize.