[vundercind]

No, their role is a lot larger than that and plenty of legal questions don’t hinge on this kind of thing. This is specifically about whether to tend to defer to agencies on the interpretation of definitions of terms and similar things related to their mandate, so long as they remain within the bounds of reason and plausibility.

A judge could go “nope, per Chevron this EPA interpretation of ‘pollutant’ looks reasonable in this context, that complaint is dismissed, but the rest of the suit may proceed”. Now they’re expected to let those arguments play out. But answering that particular kind of question definitely is not the whole point of the judiciary.