The admirable Fr Thurston, I have argued, may not have spotted all the exciting possibilities of the Palm Sunday Rites in the Missal of S Pius V. He writes: "It is a regrettable fact that in many of our Catholic churches the oldest and certainly most interesting portion of the ritual of Palm Sunday is too often not carried out". Interesting! Apparently, palms were blessed and distributed, but in 'many' churches there was no Procession! This was also once the 'moderate' Anglican practice, because processions were High Church. The Blessing and Distribution of Sacramentals, apparently, was not!
"The whole essence of the ceremonies peculiar to this day lies in the procession." [Thurston's italic.]
This fundamental assumption lay, too, at the basis of the Pacelli-Bugnini changes in 1955.
"... we can only admire the piety which leads the faithful to preserve [their palms] thoughout the year ... [but] the boughs were consecrated primarily to be used in the procession ...".
Well ... ... up to a point, Lord Copper. But the next prayer calls these olive branches a 'tuae gratiae sacramentum'. This interesting phraseology must go back to before the word 'sacramentum' had had its meaning limited by the precisions of systematic theology (O'Connell/Finberg nervously translate it 'sacred symbol'). But it was, surely, even then a strong word.
I think we may have here a genuine deepening of understanding resulting in a, frankly, more sophisticated appropriation both of Scripture and of Ritual. The much despised peasant kneeling and kissing her palm cross and carefully preserving it throughout the year may, just possibly, have been onto something which Archbishop Bugnini and Papa Pacelli never quite spotted.