Underpowered? overloaded.

[Jumoschwanz]

I don't see the point to this post. The military puts up specifications it wants for an aircraft, and then multiple manufacturers put a plane together to compete for the contract. The designers not only have to try and meet the specifications, they have to work around available materials and technology. On top of those obstacles there is always government corruption trying to give the contracts to manufacturers that do not always have the best aircraft designs.

With all that in mind, it is silly to fixate on a designer or engineer about the performance of an aircraft.