" Here is an honest opinion, even the modern-day tune is quite unlike most traditional tunes".

Steve, I have no intention of ever resuming my career in prolonged Mudcat exchanges, (been there, done that) but I would really like to know

A: what is the common factor in "most traditional tunes" which is absent in "Sweet Nightingale" , and
B: are there many (or any) other traditional tunes from which this common factor is also absent?

Feel free to be as musicologically technical as you want.