I think that Arithmatick is the gold standard for abilities that make the game no fun to play any more.

I can't really think of a case where a character is best served by using only the abilities intrinsic to their class. Even if you are avoiding the most OP abilities (which does make the game a lot more interesting, as there starts to be more choice) you still need to mix and match abilities between classes to get the most out of your party. And besides, constantly changing the jobs up makes it more fun!

As for Teleport, truth be told I think Move +3 gives you more utility in most cases. While Teleport is certainly invaluable sometimes the extra move can usually allow you a round about route to overcome height differences any ways. But yeah, aside from those two there is little reason to use anything else.

Re: Stat Growth
Yes, your stats are dependent on what classes you level up in. However all classes have equal MA growth* so you aren't going to get anything there. Typically then the most useful stats become Speed and PA, which are best served by a Ninja. Also, if one is truly dedicated to being OP they can level down in a class with terrible stat growth (Bard) and level back up in a class with excellent stat growth (Ninja) to have stats that would normally not be possible at that level.

*except Mimes, but good luck leveling up one of those.