Normal people get slammed into a wall by monster, explosion or whatever, stand up and walk away. Buddy, you don't walk that off. People die or need months of recovery from less.
Don't get me started on the speed force. You do some napkin math and see the Flash is taking on a 1000G running in circles close to mach 2 without blinking and then gets knocked unconscious with a single punch in the next scene. Flash is not the only one of course.
And the lone inventor developing a fully conscious AI in some mountain cabin on an old laptop. It was clear that would never work and reality now shown us AI companies looking into nuclear powered data centers to speed up things.
But also worth remembering that kid who made a nuclear reactor in his shed. Ai wasn’t around back then, but if it had been then, maybe, juuuust maybe….
It's more about good writing. It's often said you're allowed to have one cheat. You have to be consistent about it and the rest of the rules of the universe still apply. But often enough in fiction the writers start breaking any rule or law of physics when the plot requires it instead of fixing the plot to follow consistent world building. It's lazy writing and bad for immersion. A lot of the tension in a story is from the characters overcoming limitations, not having limitations disappear whenever convenient.