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The mono to stereo on Youtube must be a default setting.
Agree that the mono - stereo difference is tiny when used the way I did. But film a truck coming out of the distance from the left, driving right past you and then disappearing to the right and the stereo effect is really cool. I'm guessing the stereo is also really useful if recording eg. chamber music. You'll be able to hear the violins off to the left and the cellos off to the right. The two little Azden stereo mics are oriented at 120° from each other.
I'll bring the Azden next time I'm in the shop if you want to give it a spin. By nature, I expect the large diaphragm mics you use would sound better because they are just that, large. But if someone wants to buy just one, as I did, then this quite small, mono-stereo Azden which can also sit on my camera's hot shoe is about as versatile as it gets.