Brussel's soil is great for them, in that it retains a ton of water, and fertilizer, and limits their water bill, limits the time spent watering, payment for someone to hand water, or infrastructure to automate watering.
My biggest gripe is that they use the same soil on their high dollar trees (which have gotten even higher and harder to come by in recent years). These trees are then purchased by the unsuspecting and uneducated. I say uneducated as I feel that the vast majority of clubs do their members a disservice by not teaching good curriculum, whether for lack of knowledge, lack of effort, or good old American "I know better than you".
Before I started studying with Boon our clubs resident line expert advocated using electric hedge trimmers on pines. In recent years he has proclaimed pines won't grow in or area. Could be that his soil sucks. Could be that he's still working out of a book from the '70s.