This wasn't to say that Seraph's were lacking. These were still existences that could rule over several quadrants even in the Primordial Era. Rather, this was related to a secret of the elves…
The truth was the wings were a gift given by the Sky God, Zeus. However, in that chaotic era, trusting people, even those you called your own, was foolish. As a result, Zeus placed a limiter on Angels.
The irony was that the more pairs of wings angels had, the more powerful they became. But, at the same time, the more pairs that appeared, the more restricted one would become. After all, one's back had limited space!
However, the foul reality was that this was only a surface problem. When wings began to increase in number, they would re-route the meridian pathways of the body. This led to a restrictive effect that made future cultivation more difficult. This wouldn't be obvious in lower realms, but within the Dao Realm, each step would become unbearably slow!