He's talking about topping.
I don't top my plants either
Looking good so far backyard farmer. Definitely going to keep watch.
Why would you not want to top? More surface area more bud sights. I top pretty heavenly an "super crop" bending the top branches to 90 degree angles. They get a bit wider an shoot up 3+ heads.
I'm guessing reduced yield due to shorter height and hedging (more surface area overall, but less surface area that gets direct sun).