Whether adjustable T foils are banned or are not banned really makes no difference in the long term, they are just not going to be able to be used to gain any advantage over non adjustable ones on any OTB catamarans, I would cover any amount of money that any one is prepared to bet that this proves to be the case.
So why ban something that is so improbable as to be an absolute "non event"?
If some one came up with a “silly” proposal that a gaff rigged sail was faster would anyone even consider incorporating it as a restricted option for the class? Of course not, something’s are just so self evident that they do not need enunciating (or incorporating in writing as in this case) Take a good look guys adjustable T foils are just not going to happen on cats (not without hydrofoils to the bottom of CB/ dagger boards any way)
Careful guys, the more restriction that are added move the “class” closer and closer to a “one design class” and that is definitely outside “the spirit of the class”. It is either development or it is one design, which do you want? A box rule is fine until it becomes so restrictive that there is no room left in it to move, then it is no longer a box rule but a ODC.