Hymns and songs almost invariably have bits missing, and even if the printed version doesn't then the performed version will.
More extraordinarily the central prayer of the Christian Church has a bit missing.
Our Father, which art in heaven,
Hallowed be thy Name.
Thy Kingdom come.
Thy Kingdom come.
Thy will be done in earth,
As it is in heaven.
Give us this day our daily bread.
And forgive us our trespasses,
As we forgive them that trespass against us.
And lead us not into temptation,
But deliver us from evil.
For thine is the kingdom,
The power, and the glory,
For ever and ever.
Amen.
Here's the Roman Catholic version:
Blessed be the great Mother of God, Mary most Holy.
Our Father who art in Heaven,
Hallowed be thy name;
Thy kingdom come
Thy will be done
On earth as it is in heaven.
Give us this day our daily bread;
And forgive us our trespasses
As we forgive those who trespass against us;
And lead us not into temptation,
But deliver us from evil.
My attendance at RC services is almost non existent - the last time I was left hanging by this version of the Lord's Prayer was in a fiercely evangelical church and the time before that in a middling cerebral Anglican church.
The rationale for the haircut prayercut seems simple enough - the oldest transcripts of the Gospels (usually but not universally deemed to be the most reliable) don't have the final doxology in.
To me, the question is: What do we gain by taking it out?
The answer cannot be that it gives a better ending. Mostly, when I've heard it in its truncated form, the leader adds Amen which is an unconscious admission that the truncated version doesn't feel that it ends right.
The answer cannot be that the doxology doesn't fit the prayer. The meaning of the doxology echoes the opening lines of the prayer about the kingdom and divine glory of God. It reflects the grounds of confidence that we might be delivered from evil.
The answer must be that it is more Biblical. This seems simple and straightforward enough. Until we ponder that in the Roman Church being Biblical is hardly a stated priority with its varied forms of hierarchical authority. A Church that has in central liturgy a prayer
Blessed be the great Mother of God, Mary most Holy.
Blessed be her Holy and Immaculate Conception.
Blessed be her Glorious Assumption.
Blessed be her Glorious Assumption.
Blessed be the name of Mary, Virgin and Mother.
Blessed be St. Joseph, her most chaste spouse.
doesn't really need to exercise itself too much about being exactly Biblical! Similarly, by his writings I am fairly sure that the Lead Vicar in the cerebral Anglican church I gave as an example doesn't believe the Lord's Prayer was actually uttered by the Lord. So his problem with it is hard to understand too.
That leaves us with the Biblicist church who may have some grounds for leaving it out because it's not in the Bible (though surely most of our other prayers aren't either?) But even that isn't straightforward because this doxology IS in the Bible - 1 Chronicles 29:
11 Thine, O Lord is the greatness, and the power, and the glory, and the victory, and the majesty: for all that is in the heaven and in the earth is thine; thine is the kingdom, O Lord, and thou art exalted as head above all.
Shall we just keep saying it, eh?