FWIW, I saw a lot of lousy cyclists while watching the IM Wisconsin last month. I actually saw a guy climbing the toughest hill in his aerobars...STANDING
Lots of low cadence, people in aerobars going up hill at 10 mph, etc. A friend who was in the race said it was worse from her perspective.
No, not all triathletes are poor bike handlers (my friend is very capable and I've ridden thousands of miles with her), but many don't have the time in close pack rides.
Road bikes are made for riding in packs, TT bikes are not.
-murray