The mens is that the prescription of the Institutio Generalis Missalis Romani, no. 43, is intended, on the one hand, to ensure within broad limits a certain uniformity of posture within the congregation for the various parts of the celebration of Holy Mass, and on the other, to not regulate posture rigidly in such a way that those who wish to kneel or sit would no longer be free.
My only comment on the issue is that I have visited churches to go to Mass in Italy (extemely old churches including Saint Peter's), India (churches over 600 years old and newer ones), Barbados, South Africa, England, California (lived here since 1960), Boston, Tennessee, Kentucky, Baltimore, Minnesota etc. where kneeling after communion has always been the custom. Just as I could not figure out what happened to the promised coming ice age in the 1970's, I can not figure out when standing was the custom in San Jose. I believe the word custom is misused, because the word innovation seems more accurate. As to the Cathedral of San Jose, the shock after all the expense of rennovation was that the Blessed Sacrament is behind a great wall not to be seen by those entering the sanctuary and the kneelers were removed. The shock still lives on as a dose of post-traumatic syndrome to many of us.
Some further articles related to this posting:
1. Vatican: Receiving Eucharist kneeling will be norm at papal liturgies By Carol Glatz, Catholic News Service
2. Pope explains why we kneel: http://youtu.be/K-NTnt_BXdo
3. Why Kneel for Communion by Sandro Magister (Well worth the read!!!)