there is a balance to meet, who wants to waste most of their grow waiting for roots to catch up, plant it right the first time. "hey let's rip this baby out of this womb and put it in a bigger womb, it won't do anything but sacrifice a 8th of ur growing season lol, some will disagree but the plant like to work on one part at a time. that's why u see a seedling go from one inch to one foot in a couple of weeks and then slow way down sometimes, if they don't have to wait for a transplant they don't slow down. I will never understand it, u have to water less often, the grow is more natural, ur not poisoning ur roots with light and raw O2, unlike the single molecule oxygen plants draw thru the soil. and lastly, less mess less money less work and less risk