Hey now, even the practical application of cutting a typical 10 layer onion was left as en excercise for the reader. Quoth:
"So, the best depth for an onion with ten layers would be somewhere between 0 and 0.5573066. I have not investigated this in depth, but this seems like a fun next step."
You are suggesting something even more advanced. :)
Another onion enthusiast has sent me python code that considers finite-layer onions, and that code will be featured in the upcoming journal article.