Iíve heard for many years that leaving all the green fronds on a palm is best for its health. But I had never heard that the hacking you illustrate here = no trunk growth. Thatís interesting and useful to know.
I do recall the late palm guru Robert Lee Riffle say, ďif you need to trim the green, for example to better allow pedestrian passage, go ahead and do it and donít worry about itĒ.
I have done some Trachy limbing over the years, but nothing as severe as your example. I did some such limbing just yesterday, in order to bring in more natural light to a pair of dwarf palmettos that have some scale insect and are situated right below the Trachy. My experience is the more shade on palms, the more likely they are to have scale.
Thanks for posting!