The appearance of a logical argument is easier to achieve and often good enough for their purposes (publishing papers, winning lawsuits).

Connections are far more important IMO. The opinion itself is there for the plebs so they don't revolt when the high-IQ trickery flagrantly mismatches the plain language of the constitution. The courts are really the main thing nowadays that can provide legitimacy to the acts of the state since it doesn't follow the people or the documents authorizing it.