Hoodooanswered grow question 4 years ago I top autoflowers from 5th node to 3rd node. I remove the first node branches and leave the 2nd and 3rd node to grow in 4 different directions. I will LST these 4 branches once they are long enough.
I have also done topping two side-by-side, then LST versus no LST and found that LST definitely stunts them a bit but nothing major. Just my experience.