Originally posted by Paddy
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This is similar to trying to control a system with a big lag. You see a response which has an error, so you tweak the control signal to alter the response, but due to the lag nothing changes. You make a bigger change to the control signal expecting a change in the response, but yet again nothing changes. So in the end you either bringing the control signal to 0% or 100% trying to "force" a change and then at some point all the tweaking you've been doing finally "catches up" and you end up with a huge change and a massive error. This is why so many has been saying you need proper track and trace badly to predict what might be happening in two weeks time and start your "tweaking" early on. Bringing measures like this tier system is too little too late and leads to bad decisions later on based on untrue assumptions (ie. whatever we introduced isn't working now, so we need more drastic measures).
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