Here’s a second mention of “organic improvement” with regard to liturgy:
All members of the Eastern Rite should know and be convinced that they can and should always preserve their legitimate liturgical rite and their established way of life, and that these may not be altered except to obtain for themselves an organic improvement. All these, then, must be observed by the members of the Eastern rites themselves. Besides, they should attain to on ever greater knowledge and a more exact use of them, and, if in their regard they have fallen short owing to contingencies of times and persons, they should take steps to return to their ancestral traditions.
This seems sensible: learn and know more about the liturgy you celebrate. Note also the importance given to “ancestral” traditions. The post-conciliar Roman tradition and the liturgical movement favored the Patristic Era over the Medieval.
Those who, by reason of their office or apostolic ministries, are in frequent communication with the Eastern Churches or their faithful should be instructed according as their office demands in the knowledge and veneration of the rites, discipline, doctrine, history and character of the members of the Eastern rites.(Cfr. Benedictus XV, Motu proprio Orientis catholici, 15 oct. 1917, Pius XI, Litt. Enc. Rerum orientalium, 8 sept. 1928, etc.) To enhance the efficacy of their apostolate, Religious and associations of the Latin Rite working in Eastern countries or among Eastern faithful are earnestly counseled to found houses or even provinces of the Eastern rite, as far as this can be done.(Praxis Ecclesiae catholicae temporibus Pii XI, Pii XII, Ioannis XXIII motum hunc abunde demonstrat.)
In other words, we don’t want any unknowing idiots blundering about amongst Eastern Christians.