Farmers in europe buy mainly auger headers,drapers are uncommon and thats why Deere sells mainly auger headers there.And regarding beans...dont you think Deere did try those headers in all kinds of beans,since cutting beans is the main purpose of a flex draper???
Auger headers feed much much poorer than draper headers, its natural that the evolution of combine headers will find a way for the more efficient header to be used in all applications, saving the customer money and making the manufacturer able to sell it in all markets. Or another theory will come about that feeds better than a draper with comparable losses at openings as a sealed auger header.
I think all companies do testing, I also think all companies are capable of making mistakes. If you trust JD testing so much, I guess that would mean they have never had a poor design?
The main purpose of a flexdraper to American farmers might be to cut Soybeans. I would say in Canada, Europe, and various other markets it would be different. Lentils, Peas, Canola, Pinto, Edible, and Soybeans all come to mind when I think of a flexdraper. Not too mention cereals as well. I have heard of guys using flexdrapers who don't cut low-lying crops because their land is so uneven and rolling they want a 40 or 45 ft flexheader not a 45 ft rigid head, which makes sense. Soybeans aren't the only thing cut in the world with flex headers...