That logic works both ways, if you're going to die in 1 hit missing costs you an entire pokemon.because it's frail as fuck anyway
I'd like to discuss spikes greninja more really. I've found it's underwhelming, mostly because Greninja's only real opportunity to set them up is when it forces something like a physical wall out. Unlike a bulky setter like Skarmory or Ferrothorn you can only set them up 1 at a time, and most of the time you could have simply used an attack to annihilate what's switching in instead. It's largest benefit is its ability to outspeed and defeat almost all defoggers and excadrill/the rare starmie while also drawing them in.
Something like
Greninja@lifeorb
252spatk/252spe/4spdef timid
-hydro pump/surf
-ice beam
-hidden power [grass]
-spikes
It 2hko's all significant defoggers in the tier, as well as excadrill, starmie and the almost never seen forretress. The only problem is you lose out on beating M-venusaur.