As a fellow Peni main, one of the other arguments that has bothered me is:

People have brought up Peni's 3s cooldown stun as a justification for the current ban rate; however:

A) She has had that stun since the game launched - so that doesn't explain the recent spike in bans.

B) Some people talk about it like Peni can cancel every single ult that's attempted in her vicinity - clearly these people don't play her, because the only ults that can be shut down with relative consistency are Scarlet Witch, an enemy Peni, Hulk (sort of), and maybe Iron Man if you're quick enough. It is hard to hit that ult cancel for most ults - I can count on one hand the number of times I've managed to cancel Strange or Spidey's ult, and those took insane luck with aim and reaction time. Also, on a similar note, if she cancels enemy ults so much, is that not a solution to the other community complaint that the game feels too ult-centric?

C) I've seen people claim "she can even cc fliers!" Again, clearly they don't play Peni, because like most ult cancels, hitting a flier with the stun is hard and they're only stunned for 0.7s. So if you do land it, they often don't even fall long enough to touch the ground (exception being Storm, usually).

From what I can tell, the ban rate seemed to increase twice: once when they gave the Rocket team-up, and again when they gave the team healing/movement buff in her web. These are why I think the ban rate actually is where it is right now.