Great Question @UppersAnDowners, without a definitive answer.
Here’s an interesting grow in progress where two sister autos were topped and the other two left alone.
This training approach was adopted to increase airflow and reduce the chances for mold and mildew damage in the challenging environment for growing in the Hawaiian Islands.
After topping, the plants were also tied down to create an open and horizontal canopy.
It’s a work in progress so tune in for the results.
-Grouchy
@TARpits