I'm currently at ~2300 commendations, so I still got some way to go until 3000 but I'm getting there.
Ofc im working towards that achievement but I'm also not that excited because, well, as you've already stated, it's just another fat chocobo.

I wish it was a fancier, unique type of mount kinda like they did with the mentor mount.

As for commendation rewards, I sure wouldnt mind having some more added to the game but at the same time I'm scared what kind of requirements it will take.
Knowing SE, the next achievement may take 10000 commendations to reach. And the reward might just be another let-down. Or it might actually be awesome and make me impatient because
I know it will easily take me 2-3 years before achieving that amount of commendations.