How many churches have enough priests to do everything during Mass ?
It only takes one!
One priest can do everything himself quite handily and reverently.
If more pomp is required, an acolyte can help.
There is no need for a non-priest to do readings or distribute Communion. There is no need to place the unconsecrated bread and wine at the back of the church and then walk it up to the altar.
The Mass is designed to enable a missionary by himself in the middle of nowhere to say a full and valid Mass.
In WWII before Vatican II, priests had a small suitcase with an altarstone, stole, chalice, paten, crucifix and lectionary in it and said thousands of Masses on the hoods of Jeeps throughout the South pacific.
Typically, a church would have either one priest or a priest and a deacon. But that is not the issue. If the priest (and the deacon) alone cannot distribute Communion in the reasonably timely fashion, he can appoint extraordinary ministers of the Holy Communion. There is no objection against that. The abuse is when EMHC are treated as pseudo-priests and priestesses doing an honorary function to which they are entitled, no matter how necessary their service is practically speaking.
It is puzzling that with all the changes from orthodoxy to moderism, there has been an accompanying closing of Seminaries, Churches, Schools, and Hospitals. Were these effects considered as part of the changes? I wonder!
Often times, the priest is sitting (or standing) there with nothing to do. He'll be able to take these duties back very easily, thank you!
There are not enough priests to serve communion, let alone doing all the stuff the lay ministry does.
All those things were done by the laity back in the day