Magic. An essence that has existed since Faust created the world and is inside every living being. Everypony knows that. Applejack knows that. Her farm was proof, after all. All of the Apple Family thrived because of it, their Earth Pony magic was their blessing. However, as peace crumbles throughout Equestria, ponies recommend her to adopt machinery to her farm, to help the war effort. She doesn't want that. But as the war progresses, she has to rethink and she has to choose.
Adapt or left behind?
She likes neither.
An Equestria at War story.
Reading the A/N you should probably add that into the story organically than explaining it after the fact.
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I suppose you're right. I'll try to slide it in. Thank you for your advice.