Thank you, and thanks for stopping by. I've seen the method you're talking about.
I chose my method of LST over the one you're talking about basically to give myself experience with FIM'ing plants. I'm still learning so I want to try every method and technique available to get the best out of my grow.
I feel both methods are useful. The method I'm using works great for photo period plants since you have unlimited Veg time in which to train them. The method you're talking about is fantastic for autoflowering plants, since there will be zero stress when done correctly, and you won't lose any time when the plant recovers after topping. If you're growing an auto, and want as little stress as possible on the plant, that's definitely the way to go.
BUT... we have also had a few folks brave enough to top and FIM their autoflowers with great results.
So it really boils down to the environment, the strain, and the skill level (or braveness) of the grower. There's no single correct way to grow Cannabis, and even some far less common methods, like watering from the bottom, opposed to top watering, have worked out well for some folks.
When you ask someone how to do things, we'll answer you with what we have found to work the best for us, but never take their word for being FACT, and that it's the ONLY way you can do it. You can talk to 100 different growers, and you'll find small differences between the way each one grows their plants. And every single one can have an amazing yield.
It's up to you to find what combination works best for you