Preface: None of this represents my opinion on whether these realities are just, only that they are realities.
I only learned very recently that general strikes are illegal in the US because someone pointed it out to me.
Striking itself isn’t illegal (usually, some jurisdictions have made it illegal for “certain industries” to strike), but labor unions are not allowed to strike in solidarity with another union.
Anyway, I brought this up as an explanation of why established labor unions aren’t involved in any general strike, and why they will never be.
You may have misread my comments. Read them again.