(ROG) Is this potency correct?

[Fyrebrand]

I honestly don't even see much of a point in having these two skills if one is going to pretty much always be absolutely undeniably better.
...Was there a legitimate reason behind this?

I've asked myself such questions about many skills in this game, particularly when it comes to cross-class skills. So many of them seem completely pointless and redundant. For example, DPS classes getting access to enmity-generating skills from tank classes. Or, as a WHM, I can use Physick and Ruin from Arcanist -- but there is no reason I would ever want to. Physick is literally the exact same spell as Cure, except that my Cure spell has traits that make it better.