Most GP dressage horses would up and die if they tried to gallop the Rolex course, and that's without jumping the jumps.
Did I say that all dressage horses were unfit and cranked down, etc? No I didn't. But a lot of them are, in comparison to top event horses.
In fact I'm a fan of straight dressage too, but there's a lot to be criticized in that arena as well. The Spanish horse at the WEG and some of the performances at the past Olympics were real rays of light in a foggy dressage world.
SillyHorse, I'd like to see you on a horse performing a GP test, and wonder if your horse would show the same sort of freedom, impulsion and energy that a GP horse is SUPPOSED to show. If so, kudos, sincerely, and yes, such a horse would be fit, but probably not event galloping fit.
I'd always like to see you try to ride a dressage test on a fit event horse. I bet it'd take you down a peg or two. Especially the more TB types. A very fit TB type horse can be very difficult to get relaxed and zen for dressage.
Meanwhile there's Kittel complaining about flowers next to the arena....