I did a lot of topping but the first cut on a plants head always stunned the growth for up to a week.Oh man, i assure you if you arent topping, you are missing out on yield. I like to top a minimum of three times. Heres why you cut off the fastest growing part. So you suddenly have more than one fastest growing part. Now we end up with lateral branches seeking apical dominance. Try it out! It wont hurt. To each their own of course I just remember the first time i did it and was astounded at how much more I got per plant.
But i have seen at friends grows that bending the top works better. When u tie the top down the plants grow again way faster plus u still get a mainbud like top(not as thick but a little thicker than the rest).