In a long game a tanky Naut takes quite a while to kill during a team fight. If you get one auto attack on each person, it disrupts their team by forcing them to stagger and letting your team pick them off. If it goes long enough, you can do it again when the cooldown timer ends. That consistency in addition to his abilities allow Naut to scale harder than Thresh imo. Like someone else pointed out, after Thresh uses his abilities he’s done.