There were many apparent and hidden demerits to the implanted Aether Wisps.
However, the benefits of this method were too significant for Aksai to ignore.
He had concluded that the new and improved method was exactly what he needed.
After all, it liberated him from the rigorous practice of traditional Aether cultivation, allowing him to focus on other pursuits. He could focus on his Spirit and Qi cultivation while enabling the tamed beast soul to do the heavy lifting when it came to his Aether cultivation.
By finding stronger beast souls as he leveled up, he could progress in his mind cultivation path without having to resort to traditional Arther cultivation methods. He only needed to increase his affinity with the beast soul to claim more of the Aether essence it had in its soul.