I've played feral forever, and to rank 1 multiple times in the last three seasons, as a lot of people know.
Instant clones are not the only dumb thing in this game, nor are they the dumbest thing in the game today. They are, however, a terrible mechanic that makes the game worse.
It is very likely that, everything else constant, ferals would not be competitive without instant clones in the current environment. But, you know what? The current environment is incredibly dumb, and approaching the point where it's almost impossible to tell what team plays better in some matches because they're determined by ridiculous mechanics or straight offensive zergs, and a lot of them are just extraordinary binary (either you just win if you play decently at all, or you just lose if the other team plays decently at all), especially for certain classes.
Mages 100-20%ing people in shatters, 60k Mind Blasts, instant control, offensive cooldown zergs being the go-to strategy for tons of teams (including every priest/mage team - something that has certainly never been the case before), 100-0s in smoke bombs, 80k dances, unheeded warning procs, the human racial in general, crit RNG determining match outcomes (why does resil not reduce crit damage anymore? 200% healing crits make healing RNG ridiculous too, but 200% damage crits vs. 133% in previous seasons [at the resil cap] mean that kills are literally determined completely by whether you crit or not nearly always), and so on make things nearly unplayable and largely pointless right now in a lot of situations.
Ferals contribute to this too, both with extremely high damage (Why was FB buffed? Why are FB's mechanics still such that it has to do ridiculous damage or else it's worthless? Why are trinkets like Unheeded Warning in the game?) and instant undispellable control.
Ferals are not at all the most broken things in the game right now, but SOMEBODY has to start sacrificing things for the game to get any better. So this is an attempt at that. I've played feral since BC, when it was one of the worst specs in the game, and I'd play the spec that it was back then over what it (and the game in general) is now any day.
So, please remove PS cyclones from the game, or significantly change the mechanic involved, for the good of the game. Then, please get on to actually trying to fix the rest of it.