All gear purchases are justified ex-post facto. We all buy gear with some knowledge of the compromises and then justify those compromises after some time in the field.
I originally bought a SG evo 40/56 with the intention of using it for every species in Alaska. I put a few good years of hunting sheep, goat, and bears on it. During those years I never went on grizzly, moose, bison, or caribou hunt, nor did i feel the urge to.
I side-graded (not upgraded) to a SG terminus 7000 this fall, and sold my EVO 40/56 to a friend that I hunt with. If it weren't for trying to help a friend out, I probably would still be rocking the EVO pack for years.
Friends of mine have different bags like Kuiu, exo, and barneys bags. I've had the chance to carry all of them for at least some short period and don't think anything out there is a big enough upgrade in all categories to justify spending the money on a completely new pack system.