Yes, I understand you point ... but as I am saying this what I call harmonic is not what other put in their materials.
Just to give you a couple of hints, check the B location ( 61.8% ), check the D location measured as extension from AB (127%), check D location comparing to XA (88.6%), check D location comparing to BC swing (127%), check the structure of CD swing and small XABCD diagonal pattern within it. Hard to find more harmonic pattern that this one

... but yes, books will not mention it.
You may also try to play with with Fibo time measurements combinations and/or Fischer analysis for the Time ratios.
Also also judge by by eyes if this pattern looks symetric and nice.
It's pure harmony ... for me.
Will it work always?! Of course not, ...but fine tuning the entry from lower TF and proper locating the pattern on the higher timeframes gives you extra edge. The rest what will be left is how our psyche stands it, ... but it's another topic.