One thing I see a lot more than too much drop is too much reach. Drop to me has a pretty huge range just depending on how your shoulder blades retract when relaxed and also how you end up self selecting your position when on the rivet. Honestly, if I rode as much as pros did I would probably drop my bars another 20mm so my arms were much more locked out while riding tempo simply because it would save on upper arm strain over many hours in the saddle. Sure Gerard Vroomen doesn't think its super aero, but whatever, it'd be more comfortable.
Excessive reach also tends to thrust the shoulders forward a lot more. The way I think of it is track sprinters vs. Pozzato. His bars are so far away that he has to rotate them to some weird angle just so his wrists aren't in pain when he's gripping them. If you watch him race he also has a huge transition from seated to out of the saddle riding to get over the pedals. if you look at lots of track sprinters, or even someone like Cav, they use quite a bit less reach for their height and with their hands positioned more below their shoulders have more leverage during a sprint.
For years I had people telling me I ran too much drop so I raised my bars. I felt cramped and uncomfortable so these same fitters said to just increase my reach. Handling suffered and I had more upper back pain than ever. Even at 6 feet 2 I only use a 120mm stem, but my drop from saddle to the bars next to the stem is 12.5CM and I run classic bars so my drop to the grips is around 14cm and a lot more comfortable, better handling, and more stable. My shoulders and upper back are more relaxed and I can actually use leverage on my bars during a sprint.
Strange. I understand what you are saying, but drop affects reach too. The more drop you have, the longer your reach is in a given position. They go hand in hand, which is why riders tend to sit either lower and longer or high and short. I would think high and short would be suboptimal on a standard-geo. road bike, because, in most cases, the frame was not designed to be ridden that way, and a lower center of gravity usually results in better handling.