That's why gun manufacturers were able to make a few cosmetic changes to turn illegal guns into legal guns the last time we had a (completely useless) "assault weapons" ban. The California "assault weapons" ban was even dumber - they listed models in the ban, making it trivial for manufacturers to sell essentially the same weapons by changing the model number.
This problem has already been solved in other areas. Look at drug laws. They cover designer drugs easily - which is the exact same problem as you describe here.
And also - it can be a meta category, and it's helpful to have that. We can define semi-automatic pretty well, and the law has ways to cover "equivalents". Your scare quotes don't change that.
And yes, you can define semiautomatics pretty well. But semiautomatics will not be banned. The problem is you can't define "assault weapons" in a way that they don't cover all semiautomatics.
It's completely reasonable to put scare quotes around a nonsense term like "assault weapons". If you say that at your local range people will point at you and laugh.
What about tear gas and grenades? Automatic RPG's?
You're arguing in black and white and our world doesn't work like that. Subtlety is what makes law. Me? I'd prefer most guns were illegal. You'd prefer we all could own subatomic weapons (it seems, since you're basically implying any discussion on "level of strength" is moot).
It's not hacking language. It's subtlety. Once you throw that out the window you can't have a conversation.
> Prior to its use in U.S. firearms laws, the term "assault weapon" was limited to naming certain military weapons, for example, the Rifleman's Assault Weapon, a grenade launcher developed in 1977 for use with the M16 assault rifle,[19] or the Shoulder-launched Multipurpose Assault Weapon, a rocket launcher introduced in 1984.
> In April 1985, Art Agnos introduced in the California State Assembly a bill to ban semi-automatic "assault firearms" capable of using detachable magazines of 20 rounds or more. Speaking to the Assembly Public Safety Committee, Agnos said, "The only use for assault weapons is to shoot people." The measure did not pass when it came up for a vote.
Semi-automatic or full-automatic + submachine + machine pistols + ... is too much to say. It's a meta-category, which we use all the time to describe things and is incredibly helpful.