What's the deal with useless weapon skills?

[Ventus]

Something I've recently been scratching my head over is just why we have certain abilities in this game that don't have any functional purpose within combat even at the time they are achieved. Among the many, two that seemed to catch my eye both fell under the gladiator class: rage of halone and onion cut.

Rage of Halone:
Argueably, rage of halone could prove useful considering it's ability to augment damage as the character takes damage respectively, but its cast time and lack of damage output leaves this ability awarded from a class quest relatively meaningless.

Onion Cut:
As for onion cut, looking on the gladiator forum (at the least english one) no one seems to know what is so special about this ability or how it could prove useful.

Although some abilities inevitably become dated and useless as new ones come around, these two abilities among many others just never come into use for the player. Seeing this discourages me when I play other classes simply because past history with class abilities leaves me skeptical when I achieve a new one. I always feel like looking forward to an ability is something that will most likely end in failed expectations within this game. Most games have a fairly linear upward slope in the degree of power within abilities, although games serve well to give older abilities purpose even to the class's level cap, but having no use at all seems a little out of place.

Hopefully SE is aware of this already and not only focusing on new animations for skills, but that aside I'd also like to open this discussion up to the forum . So let me know what you guys have to say !