The benefit to max Intellect/Discipline/Strength is you get your abilities back faster. The reason class abilities were tied into Mobility/Resilience/Recovery was to further reinforce the core fantasy of each class (DPS/Tank/Support), and 7 stats would just be overwhelming to manage, so Paragon mods were deprecated with Armor 2.0. And Bubble/Well health were tied into Resilience because it was too easy to plop them down next to a boss with no thought, and speccing max Res was pretty much useless outside of some PvP situations.
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It maybe because as a titan main, the resilience stat on the whole seems useless in PVP compared to recovery and mobility. I don't really see the power fantasy realized with titans and resilience if you can easily get picked off by a single shot from a sniper or a shotgun.
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That "core fantasy" is more conceptual than actual.