East is direction that helps one to meditate upon unto self, presiding deity of this place is personified light and knowledge; so whosoever align self respectively while on prayer it really helps one as if one moves along the stream.
East facing prayer connects self with its ether path for fair interaction with self, east facing makes it easy to perceive for mind in true spirit.
Indeed all direction are equally good but east have its own merit when it comes to spiritual practice, east really help one to realize the firmness in the path of devotion.
Indeed east facing guides spirit to acquire the knowledge of sciences including material science to remove the hindrances created by ignorance.
May lord bless all.
Thanks please