1redhorse, many people who have spent their whole lives around horses have dabbled in multiple disciplines. I grew up barrel racing and pole bending as well as dressage and jumping. I have worked free range cattle in Colorado with my event horses. My show horses packed deer and elk out of the West Elk Mountains, too.
Here is a prelim eventer I was bringing cattle from one winter pasture to another. Gad she was shaggy!!
Here she is at one of her training level events at a rock wall/big drop. Ignore my "chicken wing" arms, LOL!
Horses enjoy trying new things just as much as riders do.