In YOUR opinion... as if you can read the minds of our forefathers and know for fact that their intentions at the time of implementation were in alignment with your own personal beliefs of what the NFA "should" say(?)If the Roosevelt administration had 70 years of precognition, they would have expanded their definition.
Here's a thought.... and requires no "I know what they said, but what they really meant was" interpretations based on an individuals personal belief system. They meant and intended exactly what was written, were fully capable and intelligent enough to craft legislation that would have imposed greater regulation with long term and broader implications, but expressly chose a more limited approach.
Knowing and following the tenants our nation was founded on.... that all gooberment action/regulation is supposed to be only so much as is required and erring on the side of freedom and "the people". A concept that seems to have been forgotten and replaced with, "usurp as much freedom and power from the people as the people will allow without armed revolt."