First, because it was a unanimous decision, and second, because it made clear that the Second Amendment is not limited to a particular technology.
Because the case did not involve firearms, it is ignored by many.
Caetano IS more important!
I am not a lawyer, but it seems to me that the Supreme Court’s ruling in Caetano should trump any and all state’s anti-2A laws:
“In a per curiam opinion, the Court held that, although stun guns are unusual in nature and were not common during the enactment of the Second Amendment, they are included in the Second Amendment’s protections. To hold otherwise would be inconsistent with the Supreme Court’s decision in District of Columbia v. Heller, which held that Second Amendment protections extend to arms that were not in existence at the time of the founding.
“Justice Samuel A. Alito, Jr. filed a concurring opinion in which he reiterated the importance of access to self-defense and the rights afforded by the Second Amendment. Justice Clarence Thomas joined in the concurring opinion.” (https://www.oyez.org/cases/2015/14-10078)
A “For the People” slam dunk?
In the best of all possible worlds, SCOTUS could, in one fell swoop, negate ALL anti-2A laws!