In the same forum thread on flinging, I came across this claim:
Now imagine that you don’t extend before you lunge. If, as you move forward, your opponent extends, he will likely be able to put his forte on your debole. At best, this will likely mean no one hits. At worst, he will maintain this advantage all the way through your attack. You’ll be doing the lunge, but he’ll make the hit. Worse is to complete your footwork before starting the motion of your hand. Worst of all is to withdraw your arm at the same time you lunge, ending with an arm extension at the end of your footwork.
Offensively, by extending your arm first, you are more likely to elicit whatever counter-action your opponent will make, allowing your to counter his counter. Thus, your extension can become a feint if your opponent reacts. If you are attacking in a tempo he makes, then you might just extend and lunge. However, if you are attacking out of tempo, your extension might cause him to react with an attempted parry, in which case his reaction is the tempo you can use to change lines and attack.
As you can see Telegraphing isn’t always a bad thing. What’s more, if you do everything in the right tempo, it doesn’t matter if your opponent sees your lunge coming because he can’t do anything about it.
— Steven Reich http://salvatorfabris.com/forum/viewtopic.php?p=964#964
It is an interesting theory and something I am going to have to investigate more.