Dennis, obviously, you have had difference experiences with your models than I have had with mine. I hope that you will agree that forming opinions simply based on anecdotal evidence is problematic. I got my first model 94 in 1961 when I was 16, which had been manufactured in the 50's, but over the years, I've bought, sold and traded at least 10 more from all periods. I still own 4.
The first post 64 model I ever owned and still own is a commemorative 1976 Bicentennial model. It's still in the box and has never had the action open. At the time I was working as a loan officer in a bank and one of my loan customers was the Winchester factory rep for my area of the South. He obtained the rifle for me at his cost. After getting it home and taking it out of the box, I noticed that even with the action closed, it rattled a bit.
I still had my 50's made version at the time which didn't rattle as much. So later when the Winchester rep came into the bank, I asked him about it. This was the first time I ever heard the explanation about the change in tolerances for the cast receivers and it was directly from a Winchester employee's mouth. This was eventually repeated in numerous articles I read over the years by respected gun writers and is reflected in the article I linked, which I have no reason to doubt since my personal experiences seem to bear those articles out.
Did you bother to read the gunsmith blog article I linked? It's evident that the writer seems to have done a lot of research into the subject
I also presently own two USRA mid 80's made model 94's and neither have the excessiver rattle associated with the cast receiver models.
Once again, my experiences are anecdotal also, but they have tended to simply reaffirm the linked article and the numerous other articles I have read about the subject over the years.
Cheers