CITH is older than some people realize. Take this quote from St. Cyril of Jerusalem dating back to the 4th Century AD:
*“Do not approach, then, with your wrists extended or your fingers spread; but make your left hand a throne for the right, as for that which is to receive a king. And having hollowed your palm, receive the Body of Christ, saying over it, “Amen.” Then, after having carefully blessed your eyes by the touch of the Holy Body, consume it- carefully, lest you lose any portion. For whatever you lose is evidently a loss to you as it were from one of your own limbs. Tell me, if anyone give you grains of gold, would not you hold them with all care, on your guard against losing any? Will you not keep watch more carefully, then, that not a crumb fall from you of what is more precious than gold and precious stones?..” *
-St. Cyril of Jerusalem On Reverence At Liturgy
Now, I prefer COTT over CITH, but for those that receive Communion on the hand, I strongly suggest that you receive it the way St. Cyril of Jerusalem instructed. If you do that, you can’t go wrong in my opinion.
Now, my theory is that the Church alowed CITH early on, but restricted it to COTT to prevent abuses.