Although the system introduction ended with a "but," it frankly stated that the Wind Winged Horse's flying ability was not strong.
But Char was still very surprised because he never expected that the horse pulling the cart could also be considered a Magic Pet!
When designing the game originally, he and his colleagues at the studio didn't count the creatures pulling carts as Magic Pets, because these creatures — whether it was the common horses in the early stages or the Silver Flying Pegasus, Griffins, or even Flying Dragons and Unicorns in the later stages — were just tools for pulling the Castle.
Their only purpose was to act as a power source for the Castle. Besides providing power, they would not participate in attacks or defense, and even the monsters wouldn't attack them.
In the game, there was never a setting for these creatures, which pulled the Castle, to participate in combat!