The Endless Vault Meditation Art had countless mysteries associated with it. The difficulty of its practice meant this technique was not even meant for a Mage or a being that existed in the material universe.
Andar could be argued to be a creature quite like this— A being who was not meant for the material universe.
Rowan had remade his body into something that was not mortal and not Empyrean, he had created something that was entirely new, and just maybe with his experiments he had ended up creating something wonderful, but for now, it was unknown what the limits of Andar's potential were.
Rowan was unique, and he had transferred part of what made him unique when he created Andar.
Rowan after all was still very young even though he was already ridiculously powerful, and for a Creator like Rowan, he needed experience and countless experiments before he could even begin to comprehend what his creations were capable of achieving.