yea but one thing....Another of Pinsir's main strengths is Guillotine, with which it can take down stalling Pokémon (even ones with Sturdy if it has Mold Breaker). With OHKO moves banned, that's one fewer thing it can do well, making it less powerful.
Also, its stats aren't distributed as well as Heracross's (Pinsir has less HP and more SpAtk, for instance).
1HKO moves are banned in competative play....