And everyone knows Germany's windtunnel data on the swept-wing (in all
configurations) was far more valuable than anything the Allies had
under development. I'm surprised how stupid you are to mention that at

Well,not only swept wing but also swing wing concept too.
Truth is, post WWII US designers blindly copied almost everything with a German
label.
This blind copying fury yielded good results many times,but not always.
The best known examle of copying not gone very well is F-111.