Who doesn’t hate plot armor? Sure, it isn’t necessarily good to have a story’s main characters get gunned down by randos all the time, but when a character seems to be more or less completely invincible for no good reason, well, that’s a problem. There are no stakes then.
YouTube channel Hello Future Me explains when plot armor is necessary.
Hello Future Me, as near as I can make out, is basically a channel that examines stories and offers pointers to writers. Or at least that’s my guess. I do know the creator’s explanation of plot armor and when to use it is actually quite good, so check it out below if you so choose.