The paradox starts by choosing one of two sealed envelopes; you were promised that one envelope contains twice as much money as the other.
As fortune would have it, once you switch, the newly rejected envelope becomes more valuable. This goes on forever.
My article explains the fallacy in the Two Envelope Paradox, and draws a lesson for the real world.
Promoting my "Two Envelopes" Article
The "Two Envelope" Writing Tip
Outside the math, one fallacy from the Two Envelope Paradox is that we humans can feel regret at making a choice that might not be optimal, but we have no way of testing that choice.
In your writing, you will inevitably think "I could have used a different example. That could have been worded differently. I should have used a simpler, or more poetic, turn of phrase".
At some point, you have to finish drafting and editing. Follow your instincts or your training, press the "publish" button and set your story free.
If you're writing advertising copy, then yes, there is definitely room for A/B testing. However, each test ad is its own finished piece.
This writing tip boils down to "do your best, and don't have regrets after publishing". Unlike the fallacy in the "Two Envelope Paradox", your article won't forever improve by 25% with each revision.