[You spent lifespan deducing the results of failure and conducted a summary.
The conclusion is that the cultivation technique the Human Race derived from observing Wild Beasts cannot serve as a reference for developing a technique for the Avatar.
In your view, although the Power of the Five Elements and Power of Stars are two different forces, they both belong to the Power of Heaven and Earth.
Being both part of the Power of Heaven and Earth, the Human Race needs to rely on the Beast Pattern to absorb the Power of the Five Elements, so why can the Giant Beast Avatar directly absorb Starlight Power?
After careful observation, you discovered that the Avatar's ability to absorb Starlight Power directly comes from having star nodes similar to those of a Heaven-Riding Beast within its body.
You boldly speculate that the reason the Human Race cannot absorb the Power of the Five Elements directly is due to the absence of 'Five Elements Nodes'.
