Yeah, again, it's one of those deals where the rules of magic in a given universe change how things work. In some universes you can teleport people against their will. In others you can't. In some you might need a personal item of some kind to invoke sympathy/contagion rules from "real world magic". And so on.
Mostly, the rules of magic are complex and counter-intuitive because if you tell a story where I can basically teleport your heart directly out of your chest or otherwise insta-kill you with magic, it makes for very boring stories. And since the entire point of fiction is to tell stories, "common sense" often takes a back seat to narrative.
(Sort of like how, in horror movies, the cast basically HAVE to be idiots, because if they were smart, the movie would be over in about 15 minutes.)
To be fair, this is a narrative issue again. In a realistic universe where Superman had all his powers, the first time he fights a sorcerer, the sorcerer probably gets about two syllables of an incantation or a fraction of a hand gesture out before Superman uses super-speed to gag him and bind his hands. Fight over.
(Which is actually one of the ways they had to handicap Doctor Strange in the comics at times, because otherwise he could be way too powerful - he got tied up, gagged, and had his hands tied together a lot. In one X-Men comic, an evil sorcerer literally sealed his mouth up and mutated his hands so he couldn't make gestures at all:
But yeah, in an even more realistic universe, someone like Superman is probably snapping your neck and flinging your corpse into the sun long before you can do anything to him with magic. Unless you're using magic from miles away and he doesn't know you're casting at him. But if you're capable of doing that, then no one is safe from you anyway.
Arguably, he's not actually Superman in that show. For most of it, he's essentially just a weaker Superboy without the name or costume.
By the end he's starting to approach actual Superman levels of ability - but they still aren't calling him Superman, and the workarounds they use to avoid "flights and tights" get more and more ridiculous over time. But overall, he's a weaker version of the character than, say, Justice League Unlimited Superman.
Ironically, though, he might be fairly close to a Golden Age Superman, who couldn't even fly at first (which is why he "leaps over tall buildings in a single bound"), who was only mostly bulletproof, and who couldn't lift more than a dozen tons or so (compared to modern versions whose strength literally cannot be calculated because it's in the quintillions of tons). Superman's mostly just been suffering from anime-style power creep for 80 years, with occasional resets to weaker levels.
They basically did - his name is mostly just Shazam now.
Though fun story - the main reason why DC can't call him Captain Marvel is because Marvel holds the trademark on that name. Which means DC could use the name Captain Marvel in a comic, but couldn't call the actual comic book Captain Marvel, or use the name to advertise the comic (ie, they couldn't call him Captain Marvel on the cover).
And Marvel has the name because Captain Marvel was originally a character owned by Fawcett Publications, but DC sued the shit out of them in the 40s because they claimed Captain Marvel was a Superman rip-off. And after about 10 years of multiple trials, Fawcett gave up, settled out of court, and stopped publishing Captain Marvel.
After years of decline, Fawcett eventually went bankrupt, and DC bought all their characters in the early 70s. But because they'd stopped publishing Captain Marvel, Fawcett let the trademark lapse... so Marvel picked it up in the late 60s for their own character. And has held on to it with a deathgrip since.
So DC basically got screwed out of the trademark for the character solely because they'd done their best to ruin the character in the first place. Karma is truly a bitch.
I'm aware of all this..Shazam is just a dumb name for him since he can't really say it without having lightning called
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Cid- "looks like that overgrown lobster just got served!" Bartz-"with cheese biscuts AND mashed potatoes!"