I believe it was mentioned that Reprisal does stack with Dismantle, but let's not try to weigh an optional Role ability with something a job natively has. Not every tank might bring Reprisal, and trying to claim that because they can offer it, hardly invalidates a MCH's Dismantle. Trick Attack isn't invalidated by requiring a Ninjutsu primer when MCH can just press a button for a similar effect, right?

Largely, no one wants MCH to just become "BRD with a gun", and while I agree we either need more support or more DPS, SE seems to have chosen DPS. We're now catching up to where we need to be, so now the counterargument becomes "well they don't bring as much support, so. . ." Like, what DO people want? If we had just as much support if not more, people would bash on having lower damage, or might nitpick how necessary the support is. If we got both, then it's "MCH is broken again!"