Without intention I wound up with a rosetail. His fins were real short when I got him, and I don't know how extreme of a rosetail he is, as they're still growing out. So far, no problems. He's quite active, and he doesn't exhaust himself or seem to struggle or seem unhappy. He's no slower or less active than when his fins had been trimmed by shrimp (it was even suggested at the time that he could be a plakat). And he may be slower than a one, but I wouldn't call him impaired or awkward.
But on topic, the Dumbos look like they'd have a hard time.