Quote Originally Posted by MaxiDuRaritry View Post
you're basically burning a feat permanently
Well, I mean, when you're playing a psion, no feat is ever burnt permanently (once you reach level 7, anyway)

Using that feat for a psicrystal is vastly better,
You have to already have Psicrystal Affinity to take Elemental Envoy, so it's actually 2 feats (unless you're an Erudite and get PA for free)