Ok. Simple question. So you can land safely on a given runway at Vref40 + 40 with a flap problem, but you are not allowed to do a normal F40 landing with a 20kts tailwind. Why? It can't be the LDR because that issue is covered.
Aerodynamic and handling characteristics are different in this case. Please review the basics!
Also a flap problem with Vref40+40 landing would have been thoroughly briefed whereas a last minute tail wind excursion beyond limits might probably not.