What's 'OP' about the gun is a specific thing (just how dramatically accuracy bonuses improve its usability range), and it didn't really need the (premature) buff it got.
At base, it's not an efficient gun at all, as many people have pointed out, and has way more drawbacks and lower performance than even the Reegar (another CQC gun I consider highly flawed in design, moreso than the Pir if it wasn't for the accuracy thing).
IMO, It makes more sense to tune down how well accuracy boosts the gun's performance beyond the smart choke, since its only a monstrous gun in the hands of a few classes. This gun is far from as powerful on, say, a SE as it is on a Destroyer, TSo, or GI.
Even if people hate nerfs, BW *sees* that stuff like the gun being overused in PUGs (and it is, but there's also the 'new car smell' factor going on). They collect this data automatically; there's no way the whole player base- even a majority of it- can hide that. Even if we said nothing, they'd notice. If people just live in denial, as they tend to do on the BSN, ur gonna get hit hard if/when the time comes. Best to hope that any adjustment only affects those certain classes and doesn't kill the gun for everyone (yeah I know, that may be a tall order, but the BSN can't all be a culture of depravity- let's have some hope mkay?)