Nerfed to oblivion
Can you think of how frightening Thanos is while wielding the magical gauntlet studded with six of the most powerful stones in all of existence? A man with that much power can’t be trusted! He could easily snap half of the entire universe’s population into oblivion just like that, which he totally did!
But as scary as Thanos in Infinity War was with his precious stones, he was infinitely tougher as a supervillain in Endgame, despite having nothing but his sword to slice and dice Avengers left and right. Yeah, they totally nerfed the future version of Thanos, which was probably for the best.