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Using Fracture, compared to the average combo attack, is an extra 100 Potency. It is also more efficient Potency per TP. Using it 6-7 times in a fight is like having an extra full combo worth of damage. Even if you're really selective on when you use Fracture and only use it when you have Maim, Berserk and Storm's Eye up and outside of Defiance (or Unchained) it's still significant. "Laughably marginal" is an exaggeration.
What you forgot to mention is that using Fracture is a whopping ~2% increase in damage with a nearly identical increase in TP consumption that also ends up ignoring the effects of bottoming out TP upon your damage due to a decrease in ability to maintain buffs, debuffs, and DoTs due to bottomed out TP. Talking about an extra full combo of damage seems like a lot until you realize that one extra combo sits on top of 50. It's entirely appropriate to call it "laughably marginal" unless you're simply dead set on justifying Fracture by presenting the information in a manner designed to force you to draw inaccurate conclusions (binary comparisons on similar quantified values instead of straight binary attributes or highly disparate values; swapping from unit to unit, forcing constant conversion rather than immediately applicable comparison).