why are there no flat water unlimiteds being made?

I feel like we have it all wrong in this sport. we should be wanting to go as fast as possible On flat water just like the push for unlimiteds in the ocean at the moment. (Although I think the long term future in down winding will be foils)
Flat water shouldn't we have longer boards longer water line pushing that glide further with ease going faster
16/17/18 feet with steering.

Europe and America have a lot of flat water racers anyone know is there unlimited classes in these racers?