In certain circumstances, and to accomplish certain goals -- Yes, I definitely would use a horseriding-type stance.Most of us learn/use a horse stance in training. Would you use one in a fight?
Learning an arial kick takes hard work, timing, strong legs, focus and dedication. Once again, not great for fighting, but may have a place in the mental and physical training.
The whole key is to know when and why...
Jump moves, leaping attacks, and aerial kicks have a place and purpose in fighting. But they have to be used properly, and set up properly.