>Superman The Animated Series just made him weaker than then-current comic canon with no reasoning beyond the unspoken "the show just wouldn't be entertaining if he didn't struggle before winning"
>STAS was and still is popular in spite of making the Man of Steel get slapped around
"Just put kryptonite everywhere", "have him fight all his super strongest villains", "red sun this, magic that", "make the city his healthbar". Nonsense, all of it. Make him as powerful as you need him to be to provide a challenge but still capture the essence of being a superhero. That's it. Stop overthinking it.