This has still been the core argument of yours, that Kings Rock is a necessary item due to how bulky OU is. It's an interesting argument to me considering you can cripple bulky offense/stall teams using things such as Taunt/Toxic/Trick/Hazards/Set up moves, while there's really no way of countering something luck-based such as Quick Claw or Kings Rock.
Rotom-Wash & Magnezone immediately stop this, and they're both extremely common in OU. What stops King's Rock or Quick Claw? These are unskillful items that cannot be predicted or played around, compared to the other luck-based mechanics in the game.