Pariah Pirana:
How are adding these gestures different than adding the orans position or hand-holding?
Here is how it is different. I just found this and will verify that it is correct this weekend with my Uncle.
"There are also symbolic problems associated with their doing so. No matter how the posture may or may not have been used in antiquity,
today it is a priestly posture in the liturgy.
This is repeatedly made clear in the Church’s liturgical documents. For example, the
Ceremonial of Bishops notes: “Customarily in the Church a bishop or presbyter addresses prayers to God while standing with hands slightly raised and outstretched” (CB 104).
Similarly, in the
Book of Blessings, whenever there is a blessing which can be performed either by a member of the clergy or the laity, the rubrics invariably directs that “A minister who is a priest or deacon says the prayer of blessing with hands outstretched; a lay minister says the prayer with hands joined” (BB 1999). Over and over again, the rubrics direct clergy to pray with hands outstretched and laity with hands joined.
Because of the special association praying with hands outstretched has with priestly office, some dissident elements in the Church have desired to get the laity into the habit of praying in this posture during Mass. This furthers the dissident agenda of continuing to blur the line between the laity and the clergy.
Fortunately, the recent
Instruction on Collaboration (Nov. 13, 1997) drew the line on this issue and specifically mandated that “Neither may . . . non-ordained members of the faithful use gestures or actions which are proper to the . . . priest celebrant” (ICP, Practical Provisions 6 §2).
The reference to gestures that are appropriate to the priest celebrating the Mass certainly includes praying with arms outstretched, which is probably the single most frequent gesture the rubrics direct him to make during Mass and which is clearly tied to the office of priest in the Church’s liturgical documents.
Consequently, in the liturgy, laity should not be praying with hands outstretched."
There are more instructions from the church than just the GIRM. When Bishops of individual Diocese (or individual Catholics for that matter) look at only one document, they run into problems.