The arguments supporting the use of volume all sound compelling and logical. And as I had noted here and elsewhere, I bought into the premise wholeheartedly in the past. However, I would ask that proponents of the use of volume consider putting their views to the test. Presumably, you guys more or less get your cues from price but seek confirmation from volume.
Here is my request for those of you who trade using an objective, systematic method. As you trade using price and volume (I won't refer to the use of indicators of one form or another because I don't use them and because they are beyond the scope of this thread), keep a parallel journal of hypothetical trades for the same period based solely on the price portion of your method, completely ignoring the volume component. Then, after a length of time and a sufficient sample of trades, both real using volume and hypothetical trades disregarding volume, compare the two. If the reliability and/or profitability is meaningfully higher with the use of voume, then it would certainly appear that you are deriving benefit from the information provided by volume. If not, however, then maybe it is time for you to revisit your assumptions.
In my own case, I had to revisit my assumptions. The argument can be made that I did not regard volume correctly, and that is certainly a possibility. But I don't think so. I considered volume in a number of different ways and configurations and, on balance, it added no meaningful value to me.