Why not use it?  Because it impedes unity and stands as an obstacle to prayer for some.  That it "comes closer to the truth than anything you or I have heard of" is a matter of opinion.  The Doctrine of Transubstantiation is a seminal point in a long line of "naming toward" the reality of the Real Presence of Christ in the eucharist.  If much more unity can be found in the "that" than in the how, I would prefer we focus on the shared belief in the Real Presence and leave the "how" up to God, as was previously suggested.