I feel sometimes like I'm the only one who thinks that's not how it should be, atleast in superhero adaptations. Like, if you pulled bullshit in a book series of some kind, it'd be considered a weakpoint of the story by most of the audience.
I mean, I understand why it happens. Especially in comics. The writers keep changing, so any rules that one writer sets down will inevitably interfere with the story that another writer wants. Besides that, all writers are just not equal in terms of skill and meticulousness in regards to worldbuilding. So setting too many concrete rules is just a matter of waiting for someone else to break them, either because they have to or because they are careless. With comics, it's a necessity.
But I think once you step outside of comics and you have your own alternative universe, the rules should be more strict. There should be an idea of what the speed force actually is. There should be an idea of what the Flash can and can't do. And, if at all possible, I usually prefer for them to be grounded in something resembling reality.
You know, in Avengers 1, when the scientist that Loki put under mind control was explaining the wormhole, he wasn't just using technobabble. He was using actual scientific terms, and in the correct meaning too, to explain a little about the device they were using and why it could do what it does. It went over most people's heads, including mine until I looked it up, but it adds a little something to the story when writers don't just bullshit the audience. It shows that work is being done to make something impossible be believable.