Because Tugboat is OFFICIALLY pissed off!
Naw I'm not pissed. I was just watching a round with a HX on my team and was amazed how long the round was dragging on during a match that they couldn't possibly win by running in circles. It got me thinking about flow of game play in other games, in any multiplayer game, or even single player game, and it made me realize that the class seriously messes with a good positive flow of gameplay, and compared to other cav classes it has no draw backs, at least that is my opinion.
One of the admins stated later on that a dehorsed hx is a dead hx, and that is partially true in that a hybrid cav build is more effective while off the horse, but that changes nothing from the above paragraph unfortunately.
Honestly I think the best suggestion I've heard out of all the commentors is to let master of the field spawn earlier. I think that that would fix the delay problem with the hx class without any direct nerfs, and would also facilitate some great team play with the clans.