my argument is that the "role compression" sacrifises one of the most important aspects of pokemon:consistancy. its one thing to have an attack be able to miss. its another thing to have your method of hazard placement fail 10% of the time. let me put it this way. you open with kleavor, and your opponent opens with great tusk. you get hit by earthquake, but your fine. you use stone axe to set up your hazzards, and it misses. you dont get the hazards up. the next turn, your oponent uses earthquake again and you die. you now have no hazards set. if this was gen 4, you wouldve lost the game. and you think that is a fair trade for scaring volcarona?
Your example is shitty cause what you describe is a sequence of desperate plays by the hypothetical Kleavor user (i'm assuming early game) that deserves to get punished. Great Tusk is literally the #1 Kleavor check or even counter with access to rapid spin, lots of hp & defense + ground/fighting typing, you never click stone axe there in the first place while Tusk is still remotely healthy and all Kleavor is is a opportunity for free rapid spin speed boosts. Mind you, i doubt Kleavor will establish itself as a common presence in OU, but 90% accuracy on it's one good move ain't the reason why (one of the reasons being it's shit matchup against the ~60% usage mon, not even gonna talk about it's stats & dualtyping).