Crow
Crow Person
Sure, but I didn't mean bits of plastic. I meant bits of tungsten, which has to be cast into the club head as it won't weld to steel. A more expensive process, requiring more QA, etc.
And yes, the addition of tungsten weighting does lead to a better product. Loads of top end forgings from the top brands do this to aid forgiveness, even in bladed irons.
That leads us on to the skewing of the definition of forged irons.
Most of them (or at least those with internal weights) are what they sometimes call co-forged, in effect a casting that is then re-heated and given enough of a squeeze for them to feel justified in calling it "forged".