Exactly. “Assault weapon” is an entirely arbitrary category. I’ve read the 2nd Amendment a number of times. I don’t remember there being any qualifiers in there.
They made the term up.
As someone said upthread what about assault cars?
Well that’s just stupid, so why do we allow the term assault gun?
I’m pretty sure the Brown Bess musket was the assault weapon in current use by infantry at the time the amendment was written.