It is an overblown term, everything in some way shape or form has this. Yes, even fricking IRL. I nearly died almost every time I went outside for like 20 years. I kinda just got used to it. One day, the bad luck sorta just stopped.
I guess Death just gave up at that point, there were times I choked while inside my home as well.
That wreckage aside, a story has a structure. The structure typically follows one character that is at the center, and the other branching points towards that character.
That center point is what keeps the story flowing properly. The center point can consist of more than one character to mention, such as dual lead characters, or a group of main characters.
Now, within the structure, there are many possibilities. Tools to use.
The point is to get character/s from point A to B to C, etc.
Now, you can just do this normally, but that might very well be boring. Hence, now you see how you can make this more interesting.
Adding stakes, conflicts, types of settings, battles, etc.
This branches out even more, into more complex areas.
Stakes can be from low to high. A Fantasy story for instance, might start out with lower stakes but get steadily higher over time. Though, how do you get into this?
Well, conflicts and the settings.
The conflict and setting can lead into the stakes. Which then can link into the type of battles.
This then branches out even more to the countless ways to do battles. If you are writing something that is very high fantasy, then yes, you will expect characters to be taking extremely heavy to even fatal damage.
The realism comes in with the type of setting, what works in the type of universe set into place there.
And which, it branches out again.
Anyway, I think this will go on forever. Point is, Plot Armor is an overblown term, and every story has it. Yes, even IRL has things so unbelievable happen, but it happens.
Story wise, it depends on the purpose of the writing. IRL? Good luck with that.
