It's not about it being "good" or "bad" in any kind of general rule, but more of a question of candidacy to be decided upon on a plant by plant basis.
If your plant has enough growth to be able to top at the 4th or 5th node before they go into flower (which only gives you around 3 weeks), then your plant would be considered a good candidate for topping.
If the plant isn't flourishing enough right off the bat, then it probably would not be considered a good candidate for topping out of consideration for its very short veg cycle and chance of stunting by topping too late. These kind of plants can really take off with some creative LST!
So in my opinion, there isn't (and probably never will be) a definitive answer on whether or not you should top an autoflower. Each plant must be considered in its own.
I have a journal, Tangie'matic, if you'd like to see an example of a top gone very right on an autoflower!
Best of luck with your grow! I am in my 2nd week with Smoothie Auto as well! Happy growing! ✌️💜 🌱