However as an English rider from England who has never sat my butt in a Western saddle I actually have fears of when I do:
- rising trot, half seat, two point... jumping... won't it just get in the way?
- dependency. what if I get addicted to having a horn to hang onto or even hang my belongings on?!?!?
Rising trot, half seat, and two point can all be done in a Western saddle. Jumping over things like logs is also possible (I know from experience) -- you don't even have to get into jump seat, just sit there. Bigger jumps, definitely not possible.
Dependency. Don't worry, your instructor will yell at you to stop holding on to the horn. I know that from experience also, LOL.
I went on a trail ride with a woman from England who had never been in a Western saddle, and she HATED it! She said it was too stiff and she had no range of motion in it. She didn't like the "held in" feeling at all. FWIW.