Well there is the original standup canoe: the K15.
Designers have tended to pair dugouts with pintails. This is fast, but compromises buoy turns. And since many flat water races are big on buoy turns, this would be a comprising feature. So what flat water racers probably need now is a narrow wide-tailed dugout with a displacement bow. I'm not sure we've seen one of this yet -?
It's a strange occurrence that dugouts have become more common for ocean boards than flat water ones IMO. It makes most sense to have a dugout in conditions where falls will be rare. If you fall in a tight race in a dugout, your chances of the finish you can be proud of paddle off to the horizon with the rest of the pack. Clambering back into a dugout is an undignified business.
Am I the only one thinking that the current move to dugouts resembles Jim Terrel's warning a few years ago that unregulated racing designs in regard to dugout depths and widths will lead to designs that look ugly and are too tricky for the average Joe and Joanna to paddle, and this will start limiting the appeal of racing and cause dwindling numbers? The videos of recent races look like the paddlers have legs that have been cut off below the knees. They look somehow weirdly short. It's not a flattering or aspirational look, it's a dorky look, to be brutally honest. Jim's thesis was that dorky-looking and difficult leads to an exodus of numbers.
But we've had this "boardsports vs. paddlesports" argument before, and there were passionate and reasoned arguments on both sides. So I probably shouldn't poke that hornet' nest.