Nikolaite:
There is nothing there which requires any sort of outward sign of one lay person to another during Holy Mass.
It says " all express to one another peace, communion, and charity. " So how does one “express” this to another if not by some outward sign?
Yet in #181 " After the Priest has said the prayer for the Rite of Peace and … the Deacon,… says the invitation to the Sign of Peace. With hands joined, he faces the people and says,
Let us offer each other the sign of peace. Then he himself receives the Sign of Peace from the Priest and may offer it to those other ministers who are nearest to him.
…
It falls within the Mass. The Mass is governed by laws. The sign of peace is but one part within a larger part - all under the law.
The SOP is an optional choice for the priest - whether he includes it or not - “After this, if appropriate, the Priest adds, Let us offer each other the sign of peace.”
We are being
instructed to offer each other
the sign of peace. It does not say “Let us offer each other the sign of peace, if appropriate…” Therefore it isn’t optional.
I see no doubt about what we are being instructed to do.