Hazrat you live on your tree and let us stay on ground. So the US cannot afford to buy SCAR for its special units who by the way choose their own weapons and don't have to abide by what regulars get given.
Then backed by the fact that SCAR was a program for their special forces who adopted and then discarded the rifle. let me say this again they adopted used and shelved them. Returned to better AR rifles.
That is a short lived history of FN SCAR and the SCAR programme, after that FN tried to sell it to other nations but still not widely adopted.
BUT after years of arguing we know that sense and sensibility leaves you completely when it comes to FN SCAR.