I don't understand your question - it feels like you've misunderstood something. In case that's true, let me explain a little further.
Some time ago PG observed that deep comment threads tended to consist mostly of people getting snarky with each other. He speculated that the snarkiness might be reduced by preventing people from replying to each other immediately, without any cooling off period. To that end, and since it seemed to occur primarily on deeper threads, he instigated an exponential back-off on comments. As a thread gets deeper, so the delay increases before the reply box appears.
I don't have hard figures to hand, but I feel like the snarkiness in deeper threads has indeed been reduced, and I don't feel that the quality of conversation has diminished. One could worry that good comments aren't made because the commenter has to wait and doesn't bother, but I've seen no evidence of that.
If that hasn't answered your question then perhaps you could rephrase it and try again.
Some time ago PG observed that deep comment threads tended to consist mostly of people getting snarky with each other. He speculated that the snarkiness might be reduced by preventing people from replying to each other immediately, without any cooling off period. To that end, and since it seemed to occur primarily on deeper threads, he instigated an exponential back-off on comments. As a thread gets deeper, so the delay increases before the reply box appears.
I don't have hard figures to hand, but I feel like the snarkiness in deeper threads has indeed been reduced, and I don't feel that the quality of conversation has diminished. One could worry that good comments aren't made because the commenter has to wait and doesn't bother, but I've seen no evidence of that.
If that hasn't answered your question then perhaps you could rephrase it and try again.