^^^ Sorry bro.... no offense, but thats not true at all. ^^^^
You can go crazy with it all you want. The key is to let your newly formed branches get some good size and thickness before you throw them into flowering. For instance... if you just got through chopping the hell out of your plant and a week goes by, your branches are going to be super small and skinny, unable to support very large buds... So you let them go another week to get those branches a little stronger. Then they'll support the same sized bud as what the main branch would have supported.
If you want high yields... then you need a lot of tops. You can achieve more tops by either using the Sea of Green method, where you have at least 1 plant in every square foot (I would pack them closer then that). But if your in California, like I am.... then you have plant number restrictions, so you cant cram 16+ plants under one light, cause then you'll be over the limit. So you can use methods like Screen of Green, which is what I use, to get 1 plant to fill a very large area. My last run I did 6 plants per light and got the same exact yield that I would have gotten with 16 plants. Currently Im running 10 plants for 3 lights. So Im doing 3 plants per light basically, and I'll still get the same amount of yield if I were running 48 plants.
So its all about getting as many tops to the surface as possible, and keeping them level, to create an even/level canopy. I would not FIM. This in my opinion is a ridiculous method. Its good to top your plants when there very small. Around 6 inches tall... I chop my plants in half, leaving 3-4 nodes below. With 4 nodes below, those turn into your new 4 main branches and they get nice and thick, the same way the main stem would... but now you have 4 mains to branch off of. The trick is doing it early when the plant is still small.
Then after that, use Low Stress Training (LST) techniques, like Screen of Green, or you can tie branches down individually... but a screen to hold the branches down is the best way to go in my opinion.
Here's my last SCROG grow.... each 1000 watt light has 6 plants under it. Buds are all nice and fat, the same size they would have been if growing on the main stem, untopped.