Is hypotaxis useful?

Xuanzhenzi is not the eldest son of Maoshan, and Shi Tianfu of Longhushan also declared that he is not the eldest son. I have consulted my Taoist friend in Tianshi Mansion about this harmony symbol, but he just laughed and didn't answer, which shows that it is general. Even if it works, do you really want to use it? You have so little confidence in your love?