Since we do have a lot of beginners visit this forum, it is a good idea to write instructions for them, which is why I mentioned cutting the footprint smaller.

Silnylon appears fragile but is amazingly tough. I've never used a ground sheet with it and never had any kind of puncture, even with my dog sleeping inside.

However, I'm intrigued by the idea that the footprint might reduce internal condensation!
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey