Yeah, the problem with that link is I can find ten others that claim to know the difference, too, and none of them say the same thing. I know because I did my own search earlier today.
I haven't read the Munro story you're referring to in that other post, but I can think of situations where changing the tense could work.
Elmore Leonard was a really good writer, but that doesn't mean everyone should write exactly the way he did. It's not even possible for *every* story to have lots of dialogue. Some of my favorite novels hardly have any. I don't know if you've read Life of Pi, but the character in that one is adrift in the middle of an ocean for much of the novel. Just him and a tiger in a little boat. There are pages and pages where nobody talks, and it's a fantastic story. A story about the power of story! I loved it.
I'm pretty sure when Leonard said "leave out the boring parts", he just meant we should leave out the things that don't matter to the story. You don't have to show your character driving to the store to pick up milk and toilet paper if that's ALL he is doing during that time. You can skip that part. It's not important. It's boring because it has nothing to do with anything.
Nothing much happens for long stretches of Munro's stories? I wonder if this is just a matter of taste. Like James said, a literary story might have very few action scenes, but imho, that doesn't necessarily mean nothing happens. Some stories (usually the ones I usually like the most) are about the things going on *inside* a person. I can see why you might find that boring, but I love it.
I guess the point I'm trying to make is that even if Munro isn't the greatest writer in the world, she has found her audience. Whatever she's doing is working.

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