Because Adoration ISN’T Mass. Mass is the public prayer of the church par excellence. It is the most perfect, valuable prayer you will ever have anything to do with. Traditionalists fight tooth and nail, to and beyond the point of schism, because they believe so strongly in its value precisely as it stands. Why on earth, having done so, having your ‘best thing this side of heaven’, you would then inject a mightily inferior, though worthy, prayer into it is beyond me.
I can well imagine your reaction if I were to tell you that liturgical dance, rock music and so on during Mass made me feel more like ‘Mary, the Saints and myself are united in the worship of our Eucharistic Lord’. Even were I genuinely to believe so, you’d say, and quite rightly, “THE MASS IS NOT ABOUT WHAT YOU FEEL!” You have done time and again over different private interpolations into the Mass.
Well, why can’t I say the same about saying the Rosary during Mass, which IMHO completely misses the point of communal worship? I don’t mean that ‘active participation’ or anything like is necessary, but at least we should all be focused on the words of the SAME prayers which the priest is offering on our behalf.