A fixed calendar doesn't remove politics, it just makes it schedulable. Think of a legislature: everyone knows exactly when elections come, and that certainty drives every vote, every coalition, every bit of gamesmanship. An 18-year term would do the same to the Court. Presidents, senators, and interest groups would plan around the known turnover date, and a justice's final years would be spent as a lame duck, openly pressured to retire early or time major rulings to shape the next fight. Life tenure's unpredictability is a feature, not a bug, because it keeps everyone from calculating the political value of each seat years in advance.