Pot size issues when growing from start

is this correct?:
"Cloning time to harvest time would take 5 weeks longer than just slapping her into 12/12 now. Is that not correct? "

Why never clear pots? I used pink and blue see thru buckets on my last 2 grows, with no problems (that I know of). I've tried to google it with no help. I just liked the fact that I could see the roots and how much to water.

light isnt good for the roots... they are very sensitive