I don't see the relevance to the topic being discussed.
The fact remains that the ATF enjoys the ability to unilaterally revise firearm policy well beyond what many find reasonable without a change in law made by Congress.
This scenario is precisely why the outcome of Chevron is useful -- and, I'd argue, vital in addressing areas where legislation is needed, even if we still disagree about what shape it might take.
Congress' process takes too long to adapt to conditions on the ground. The ATF has a focused mandate to study and set policy in this area without waiting for Congress to consider the issue. It might not be perfect and is still subject to political influencing as the makeup of the committee changes based on appointments, but at least something gets done.
Regarding the FCC, there is some prioritization based on the type of traffic served, but it's fairly commonsense in its approach and the committee recognized that a complete lack of regulation wasn't in the public's best interest.
The idea that everything is left to Congress -- or ignored, as the case may be -- creates a situation where good ideas don't develop into meaningful legislation or the bad ones get implemented over the will of the majority.
Again, not only does this not happen in parliamentary systems, it's not possible because the people debating the issue are all on the same side. They all agree on the desired outcome, it's rather a question of how far they want to go.
