This has always annoyed me a little bit.
Instead of adding those unnecessary HP+x% Abilities they could have added !Kick instead.
I know it isn't *that* useful but it just seems... inconsistent that it is the only Ability that cannot be learned at all.

I mean, they could still have one or two HP+x% Abilities, just not all three of them, it seems like they are just there to pad out the time necessary to master the Job.