Oh, FFS. We aren't complaining about a playstyle change. We're complaining that
a) The nerf did not fix what BW intended it to, that is, to remove OS from single target rotation (Now EVERYONE is using it single-target as filler because of the low energy cost/faster cast)
b) The nerf basically neutered a high-level aoe ability (getting OS at 49 is now totally underwhelming)
I'd also like to point out that suppressive fire is a huge energy dump, which makes it impractical at best in a sustained fight (I use it on trash for the lol factor, but I am always out of energy at the end from spamming it). Grenade also takes a fair amount of energy so using grenade then suppressive fire would definitely leave you energy starved.
You'd be better off throwing grenade (and OS depending on the # of adds/depending on how long the adds will be up) and just single-targeting said adds down.
TL;DR the OS nerf has made everyone use it single target but has removed nearly all of its aoe utility.
If OS had been redesigned in a way that removed it from single-target rotation but kept its aoe capabilities, I wouldn't be complaining. I am well aware that it is really, really dumb to have to use an aoe on a single mob to boost my numbers. I would welcome a change that would remove OS from single-target rotations, but this nerf did not do that.