But, you don't 'need' an altar rail to receive on the tongue
no, the altar rail was a separate issue from the reception of the Eucharist, but tied in with it under the species of the change in attitude and focus of direction from the Tridentine Mass (focus on God) to the Novus Ordum mass (focus on the people).
With the tridentine Mass and the focus on God, the emphasis was on the heavenly and earthly concelebration of the mass; what Christ did in heaven, the priest did on earth at the same time with the angelic host and the Holy Spirit as witness in both cases.
So the focus was on God the Father acting through the Son and at the same time acting through the priest, accepting both offerings from Christ and from the priest simutaneously, and at the same time acknowledging both offerings as holy and acceptable to Him.
And in turn God offers simultaneously forgiveness and acceptance through the medium of the transformed sacrifice of Christ. And He does this through the ofices of the priest.
the altar rail symbolizes the curtain in the Jewish temple--that which separated a sinful people from a righteous God, and the place where the people came to offer their sincere humility and pennance to God for having Offended His Holiness.
So in VAT 2, doing away with the altar rail was part and parcel with the changes in focus from God and His holiness and majesty to the people and their expressed desires, irregardless of tradition or what God wanted.
But VAT2 is not the only place we see this happening.
Look what happened in Exodus when the people decided to take worship itself into their own hands. What did we get?
In place of God we got a golden calf. and no rules.
and what happened because of this?
that generation never set one foot in the promised land.
that is something to consider carefully.
With VAT2 and the subsequent proposed changes to that we got:
rules by committee,
rules determined by social standards of the day,
no barriers (or toppling barriers)
a change in orientation from God at the center to Me, Myself, and I at the center.
challenges to the sacraments.
differences in construction of Catholic Churches. no longer do they inspire worship or the holiness and majesty of God.
today they are stark, barren of beauty, and with little to inspire
or to set them apart from other large buildings.