Ive also heard if u top them it also redistributes the thc in the bud, instead of 1 bomb ass cola you get 2 with less thc.
You heard wrong....
I grow same plant, and I harvest weekly... over and over...
I was just growing plants, and left them 'Natural'...
Then I started to FIM, and LST and using Uncle Ben's choping method, I now top my plants at the 5 or 6th node, to train, etc, and maybe a clone from it...
I feel that no matter how I trim them [method], I get about the same yield every week, week in and week out...
Now, If I want to increase my yield, I let them veg longer...closer to my lights, the nodes grow 1/2" apart the last week....
I just keep the clones coming, and every bowl, from the beggining [when I started my weekly rotation] EVERY plant, tastes, smokes, the high, all the same...
The buds just look nicer now, and no pop corn, tiny buds...Yield... also the same...
Good Luck man...