Yep this sounds a lot better then just nerfing stuff as it keeps everything else in check as you said. Sounds very much like trophic levels if you're versed in ecology. Same idea, one animal keeps other said animal in check, if you remove the animal keep the other one in check you've essentially released it from its trophic level causing everything else to become unbalanced in nature but in this case it's the crucible. Personally I think fusion rifles were keeping shotguns in check and not the other way around, because everyone at the time of yr1 was still relatively new to crucible and no one had an idea of how to counter them, and just cried nerf. Though interesting I was listening to a bungie worker be interviewed and he said he'd much rather slow something down then buff everything else. The reason for this is if they did buff everything, then it all gets turned up to 11 and you can die to quick to even react to anything.