281. Holy Communion has a fuller form as a sign when it takes place under both kinds. For in this form the sign of the Eucharistic banquet is more clearly evident and clearer expression is given to the divine will by which the new and eternal Covenant is ratified in the Blood of the Lord, as also the connection between the Eucharistic banquet and the eschatological banquet in the Kingdom of the Father.[Eucharisticum mysterium 32]
One simple sentence of fact. A one-sentence explanation follows. It’s more than the meal–it’s the fuller connection to the eschatological reality of eternal life. My sense is that clamping down on Communion from the Cup has too much of an anti-Catholic sense to it.