For the most part I do agree. Also, I think that CO2 came up on another thread that you were on and the question was "When to use CO2" and if I remember right you said that CO2 is used by the plant all threw the grow and I had stated that CO2 is best used in flower. You are right, the plant can always use CO2 in veg and flower, but for the most part, with CO2 methods being expensive and so on, I feel that in most peoples opinions, CO2 is used in flower more because the level of photo synthesis taking place is directly related to bud development and the CO2 can proportionately have a greater affect at this point, and also, when the plants are in veg and smaller the amount of Photo synthesis is proportionally less and the CO2 is questionably having even half of the affect that it does when in flower.
But you will find growers that don't even want to run CO2 in flower for fear of losing potency, but this is a small amount of growers IMO.
Sorry to high jack the thread, but I guess it is still on the topic of CO2 and I hope that it helps either way.
Adieu