Gotcha.
I actually like the idea of the shot clock because it awards a penalty point right from the get go unless a guy initiates offense and scores. There's no warning, but its kind of the best of both worlds...you get a chance to score some points or you get hit with passivity. How many matches do we see in folk where a guy knows he has a free pass stalling warning to give up and he literally runs away and turns the last 30 seconds into a game of tag? In freestyle there's none of that, if you get hit with passivity someone is getting awarded points no matter what.
The problem with your theory is you're assuming the ref has either the brains or the balls to call passivity correctly, which we've seen isn't the case.
We need rules that completely take opinions out of the equation like the push out rule. Refs as a whole have proven that they can't correctly handle calls with any modicum of judgment.
Theoretically, the current stalling rules should work perfectly, but half the refs call action at the edge like they forgot how the wrestler's ass got to the edge of the mat in the first place. Same with watching somebody wait four seconds and then jump out of bounds, etc. They get so focused on the rule its like they forget about the action as a whole.. forest through the trees and whatnot...