Quite frankly, you aren’t going to win every battle and sometimes you can win every battle, but still lose the war. I think you have done everything you could possibly do, Giampaolo. You gave them the information, went out of your way to educate them, but ultimately the decision was out of your hands.
I have had this happen a lot of times. The way I look at it: As long as I did everything within my control to make the product better, I can rest at night regardless of the decisions others make.
I wouldn’t spend too much time obsessing over that which you have little control over.