I'm not quite sure what a trailer rider is...but I have seen horses like the picture I showed winning at high level hunter competitions in both Hunter O/F and in Equitation. Also, the wikipedia article that you so kindly added also states, "A "flat" jump is often desirable in hunt seat equitation
. A jump with a great deal of bascule is challenging to ride, and is said to "pop the rider out of the tack." In a competition where the appearance of ease is critical, a flat jump can benefit the rider." I have very rarely seen horses with true bascules in a hunter competition, even on the A circuit. As stated, it makes it harder for the rider to sit and the hunters tend to like the long spot as it makes for a prettier and by default an ultimately flatter jump usually. In the jumpers they tend to have better bascules but as a whole jumpers of any discipline these days tend to be flatter and not as round as horses in the past on a whole. And I am talking about the amateur rider set, as the OP is just learning to show and is not a professional rider. I would agree that the truly good professional riders can get a horse to perform better than the average rider and will get bigger bascules and better rides out of horses.
The OP also asked what people had heard about the stud and I told them what I had heard. I also cautioned that it was not first hand knowledge so they could do with it what they wished. I had also stated that every baby I had seen under saddle out of Popeye looked pretty nice and seemed to go just fine but they were older as in the 4-6 range and I haven't worked with any personally. I simply stated that I had heard some of them were hard to start and/or work with as babies. Which doesn't necessarily transfer to how they are under saddle or after being professionally trained. I also don't agree with "fad stallions" and I'm more into breeding to improve the mare not just because a stud is "really awesome". While the babies that he has on the ground seem to be doing very well I would caution people to not get "breeding blind" and consider potential buys/leases/etc as the horse itself at that point in time and not what it could be or by what it's parents did or were.
Please refrain from attacking other users of this forum for their opinions. Just because you don't agree with my opinion does not give you the right to assume anything about me as a rider or degrade my input. Thank you.