I agree. I feel like when you reach a certain point in riding, you are able to notice the parallels between the disciplines. Working with legs, rein, seat. The goals and fundamentals are pretty much shared, but the specifics and "how to" parts of it are different. I think your comment comes down to each individual rider, their studies, and their experiences. I'm an English rider, and I don't know the technicality of western pleasure or barrel racing except for what I can observe, and what I've learned just being a horse person.