>>30682337As someone who plays pre-bank with Pheromosa on my team, there are a lot of situations where I can't really use it well.
HJK, U-turn, Poison Jab, and Ice Beam give me good coverage, but if I see a Scizor, Metagross, or Greninja on the other team I know I'm in some trouble and can't really do anything with Pheromosa that would KO a single opponent, because then they'd switch in something with priority that could totally dick me. And those three are all very common.
I've used Pheromosa. Unless the situation is perfectly suited for you to start sweeping with it (which you could do with a lot of sweepers), it quickly gets shit on. And this doesn't even bring up focus sash users.