They can create many issues for superman and retain the optimistic positive and superior nature of superman. He's not supposed to just be a man with powers; but an alien who is an example... for children, quickly turning into a Jesus like figure but with only the necessary amount of punching... he takes all the punishment then sets things right without spite, murder, etc. The child sees him getting beaten up like every cliche fight show and even though they learn he wins it's enough to make some suspense and tension that can evoke the joy of the tables being turned. The inner child remains in us all but it's harder to reach or impossible if our guards are all the way up.
It is HARDER WORK and writers will work hard to be lazy!
For example, you can go quite heavily into the mystery genre since he's over powered, he has to figure things out and then the whole part of bringing justice or making right can be quickly handled by super powers. One reason they had a smart human as his main foe was that it created puzzles for him to work his way out of. Of which was the powering down problem that got way way too old and became poison instead of just powering down... hell, he didn't fly at 1st which is where the leaping over buildings came in. Another tired thing is being in 2-3 places at once; something Flash has to deal with almost exclusively...
Like magic fantasy, an unknown made up magical (or newly disclosed ability) whatever just solves every trapped plotline... or going back in time by flying really fast around earth (which was supposed to be the lame escape for superman 2 the movie but was stuck into superman 1...either way it was LAME! 2nd movie ended better because they put it's planned ending on the 1st movie. 1st could have simply had her survive in a hospital with him helpless with human doctors being the only ones that could save her...then him praising them with a good line that might have inspired a bunch of kids to get into medicine and be REAL heroes! There, that took no time and effort...who do they get to make these movies??? In a few minutes I made a better movie that had real consequence.)
Adults get hung up on this stuff because we're still children inside but cling too much to our childhood these days.