"Life and nature are the essence of humans; desires are their benefits. With essence intact and benefits in abundance, nothing exceeds clothing and food. Once clothing and food are sufficient, nothing is as remote as pleasure. The pinnacle of pleasure, reaches the Great Dao of Desire..."
Because Ancestor Dragon diligently developed the Water Element Great Dao, perfectly integrating it with the Desire Path, making [Desire] the mainstream Great Dao of the Dragon Clan.
The saying "nine dragons out of ten desire" describes the cultivation status of the Dragon Clan.
Even if not primarily cultivating the Desire Path, Dragon Clan cultivators more or less dabble a bit.
For instance, Azure Dragon.
His primary cultivation is actually the Mu Yi Great Dao.
But as a Da Luo Supreme, the "Heaven and Earth Yin Yang Joyful Poem" he cast is still powerful, unmatched by the Four Seas Dragon Gods.