Adoration is used as a replacement to supplement what is missing in the Novus Ordo, in my estimation.
I really don’t mean to be a pain, but can you clarify what you mean by this.
What is missing? Is there something liturgical that is missing, or do you mean this in the sense of the loss of a sense of sacredness on the part of those who like and prefer the Tridentine rite?
The things you mention in your first sentence are abuses that have been allowed.
I don’t see how these are “liturgical” abuses, because they do not really pertain to the liturgy itself in teh case of altar girls. Altar girls are assistants, they do not preside, nor are they necessary for the liturgy to take place. Liturgical abuses are those things that actually change the ritual meaning of what the liturgy is attempting to do.
Eucharistic ministers receive communion from the priest (if it is done correctly according to the GIRM), and they distribute the Eucharist as a sign of unity of the Body in sharing of the breaking of the bread. The sacramental action is meant to mirror the more ancient ritual described in Scripture and the early practice of the Church where the eucharist was a meal of thanksgiving and the presider and community formed a sign of the unitive act of Christ being present both in teh community gathered as well as in the consecrated gifts. The emphasis is different to be sure, but the use of Eucharistic ministers is a valid practice according to the mind of the Church because the ritual action is a sign of the unity of the body of Christ WITH the priest. The Tridentine Rite places the emphasis solely on the consecrated gifts. Both are correct within the ritual action of liturgy. The difference is only in the emphasis.
In regards to the eucharistic portion of the liturgy, it is meant to express the sacrifice of the cross as an eternal event, the active remembrance of the new covenant, the ritual meal of communion in the breaking of the bread that brings unity of those partaking to God the Father in Christ through the Holy Spirit, and the sign of the eschatological kingdom to come.
To me, those are the essential elements that need to be changed in order to qualify as a liturgical abuse. The Novus Ordo itself does not violate any of these.
Now, if the priest were to change the eucharistic prayer, or fiddle with the rubrics in such a way that the sacramental action of the priest and faithful do not actualize the sign they are to signify, then that is what real liturgical abuse is, IMO.
Those ritual actions that signify what the liturgy is and does, cannot be abuse becuase they are truly proper to the sacramental action that the liturgy is attempting to accomplish.