In addition to the issue of obedience, I think this question concerns the usurpation of priestly duties by lay people, and the resultant impoverishment of the liturgy and the denial of the fullness of what Christ wishes to give the people. For me, the sign value of the priest distributing Communion is very important; acting through the priest, Jesus feeds Himself to the people. No EM can replicate this experience.
As for taking Communion to the sick, the homebound and nursing home patients, what happens if they need to go to Confession? We cannot assume that the condition of being old or sick or confined renders a person incapable of mortal sin. So what happens - the person has committed a mortal sin, has no access to a priest without calling attention to himself by making a special request, and is presented with an EM bringing the Eucharist. How many people will say they don’t want to receive until they’ve seen a priest? Their right to their good name is infringed by this situation. No one should have to announce the fact that they are in mortal sin to anyone else, even if only by implication.
In my opinion, priests should place their Sacramental responsibilities first on their priority list. Nothing is more important than service to those in their spiritual care. If this were more routine, I believe that priests would find much more personal fulfillment in their ministry and there would be less of a vocations crisis. We must let priests be priests!
Betsy