German forward swept wing WWII fighter projects.

Here's a question-- the Germans had several forward swept wing designs
in the works during WWII.
However, I recall reading that even in the 1980's the strain on the
airframe made such a design very difficult to successfully carry off.
That being the case, was there any realistic chance that such fighter
designs could have been successfully fielded, or is this a case of a
severe underestimation of the problems by the engineers?