Well, true, but I never found Black Chocobos all that great on their own, and riding a Chocobo essentially means you're fighting with one less character. And I seem to recall all Chocobos including Red (and most early monsters in general) not scaling well with level.
I mean if you just want the lulz in Zeltennia, sure, but Teleport is always incredibly useful. Having at least one character with it is very helpful, and having it on Ramza can be a lifesaver on a few occasions.
--
"One toot on this whistle will take you to a far away land."
-Toad, SMB3