High impact fusions (wizened rebuke and Erentil) should not be able to roll backup plan. Regardless of their lethal range (Let's be honest, it's way too much.), part of countering fusions, especially of that archetype, is sound queues. You hear it charge, so you bait the shot and then punish. Simple up close, annoying when you get mapped at a distance you should have been safe. Also, the disadvantage of high impact fusions is their charge time. It's the longest in their class, as it should be. Backup plans eliminates both of these. Sound queues go out the window. Charge time becomes nonexistent. And the lethal range doesn't change very much at all. Certainly not enough to warrant the advantages of the perk. So in short, high impact fusions should not be able to roll with back plan, as the perk currently eliminates the key disadvantages of the gun with no drawback and eliminates a key aspect in countering the use of fusions, i.e. sound queues.
You ever been killed by a precision frame fusion rifle? Both the tempered dynamo and the epicurean have backup plan, and are pretty good to use in the crucible still. And you don’t even need backup plan either. A max range erintil can work just as well with any person who knows how to take advantage of radar. I would guess you would complain about that next with it’s envitable nerf. Let me guess. Your a shotgun stompie hunter who is tired of getting countered by erintils? I wonder. How angry would you be if there was a severe shotgun nerf or even a stompie nerf somewhere next season? You would probably have to change your load out quite a bit, and would then complain on the forums trying to argue against the nerf. Ahh, the bungie forums. Be careful what you wish for. You might find it having unexpected consequences in the future.