The GIRM does emphasise the importance of everyone listening to the readings.
For example, from the 2002 General Introduction to the Roman Missal (GIRM) which can be accessed from
romanrite.com/girm.html :
“29. When the Sacred Scriptures are read in the Church, God himself speaks to his people, and Christ, present in his own word, proclaims the Gospel.
Therefore, all must listen with reverence to the readings from God’s word, for they make up an element of greatest importance in the Liturgy. …”
“101. In the absence of an instituted lector, other laypersons may be commissioned to proclaim the readings from Sacred Scripture. They should be truly suited to perform this function and should receive careful preparation, so that the faithful by listening to the readings from the sacred texts may develop in their hearts a warm and living love for Sacred Scripture.”
“360. At times, a longer and shorter form of the same text is given. In choosing between these two forms, a pastoral criterion must be kept in mind. At such times, attention should be paid to the capacity of the faithful to listen with understanding to a reading of greater or lesser length, and to their capacity to hear a more complete text, which is then explained in the homily.”
So I think listening should be encouraged.
I think it is a shame at weddings and funerals when people are given a printed booklet with the text of the readings. People feel they should follow it and sometimes all turn the page over together in the middle of the reading. Its not as it should be, listening to a lector who has taken the time to understand and convey the text.
The USCCB’s Bishops Committee for the Liturgy expressed similar ideas on participation aids in its 1998 Newsletter:
“Its clearly preferable that the word of God be clearly heard by all who participate in the liturgy, for “In the hearing of God’s word the Church is built up and grows”. (GILFM 7) For this reason, the printing of readings and presidential prayers in participation aids is discouraged, unless other circumstances make it impossible for the word to be effectively proclaimed. Even in these instances, however, it is preferable that steps be taken to assure the effective proclamation of the Scriptures rather than resorting to providing a “read along” text to the members of the assembly.” (From
usccb.org/liturgy/innews/798.shtml ).