Actually I didn't say it doesn't exist, what I said was that you in particular are using root bound as your scape goat cause you can't see the real problem. There is no way the plants got root bound in a few weeks, I simply don't believe it. I saw the pictures, those plants were not root bound at all, they had a long time to go.
As for your little comments there I'm just gonna let that slide, no stupid names from me there bud...I'm not 15
Regardless of what you want to believe I've kept plants in cups for over 6 months, if they'd been root bound at three weeks I really doubt they'd last as long as they did in there...something to consider.
Maybe you should take your own advice here, do some more reading and look into what else could cause the problems you seem to have. Turning around and telling me that plants a few weeks old are already root bound is ridiculous.