Ah, if that was their only point, then I should have pointed out that a better operating department can achieve a lower waiting time with the same degree of slack. I understand the utilization rate tradeoff and that's not the issue.
I'm glad you've enjoyed writing your comments--like your style. :)
Ah sorry, slightly misinterpreted, my understanding was that without slack you cannot stabilize queue sizes which makes OP incorrect(?)
Yeah, more efficient nodes can delay that effect, but it seems that in real world system the existence of buffers means that consequences are delayed in ways that have significance (across careers, elections, etc) and those factors tend to dominate.
yw, nice that anyone reads it, without that i'd just be another mad shouty bloke on the internet, maybe i still am :)
I'm glad you've enjoyed writing your comments--like your style. :)