They should only be used in EXTRAORDINARY circumstances, not a matter of course.
This is the teaching of the Church. And the truth is that EMHC are over used and in the majority of Masses they are not needed.
DOMINICAE CENAE
OF THE SUPREME PONTIFF
JOHN PAUL II February 24, First Sunday of Lent, in the year 1980,
11.9 In some countries the practice of receiving Communion in the hand has been introduced. This practice has been requested by individual episcopal conferences and has received approval from the Apostolic See. However, cases of a deplorable lack of respect towards the eucharistic species have been reported, cases which are imputable not only to the individuals guilty of such behavior but also to the pastors of the church who have not been vigilant enough regarding the attitude of the faithful towards the Eucharist. It also happens, on occasion, that the free choice of those who prefer to continue the practice of receiving the Eucharist on the tongue is not taken into account in those places where the distribution of Communion in the hand has been authorized. It is therefore difficult in the context of this present letter not to mention the sad phenomena previously referred to. This is in no way meant to refer to those who, receiving the Lord Jesus in the hand, do so with profound reverence and devotion, in those countries where this practice has been authorized.
11.10 But one must not forget the primary office of priests, who have been consecrated by their ordination to represent Christ the Priest: for this reason
their hands, like their words and their will, have become the direct instruments of Christ. Through this fact, that is, as ministers of the Holy Eucharist, they have a primary responsibility for the sacred species, because it is a total responsibility: they offer the bread and wine, they consecrate it, and then distribute the sacred species to the participants in the assembly who wish to receive them. Deacons can only bring to the altar the offerings of the faithful and, once they have been consecrated by the priest, distribute them. How eloquent therefore, even if not of ancient custom, is the
rite of the anointing of the hands in our Latin ordination, as though precisely for these hands a special grace and power of the Holy Spirit is necessary!
11
To touch the sacred species and to distribute them with their own hands is a privilege of the ordained, one which indicates an active participation in the ministry of the Eucharist. It is obvious that the Church can grant this faculty to those who are neither priests nor deacons, as is the case with acolytes in the exercise of their ministry, especially if they are destined for future ordination, or with other lay people who are chosen for this
to meet a just need, but always after an adequate preparation."
Where is the just need when you have a Mass with 200 people and you have eight EMHC doing what the priest should do.
