m0useanswered grow question 3 years ago I've ran two side by side autos and every time I topped them by accident "week 6-8 outdoor" or on purpose "week 3-4 indoor" they've always out preformed the other un-topped plants.
It is strain dependant a lot of the time I think. If the auto you are growing is smaller and less aggressive in growth I'd probably not top it. But if your wiling to try, do it. I'm also using LST with any auto and that alone can be just as effect as topping it with no LST in my limited experience.
Best of luck