In his concurring opinion, Justice Nielsen offered additional thoughts on subject-matter jurisdiction: “Subject-matter jurisdiction is categorical (the kind of case that a court can hear) and its lack renders a judgment void and subject—at least to some degree—to collateral attack. Case-specific jurisdictional concerns (like proper service invoking personal jurisdiction, compliance with deadlines, or justiciability concerns based on the particular parties) makes a judgment merely voidable. If these types of concerns are raised timely, the judgment can be undone; but if not, finality prevails.”