Hi Poor Knight,
Phemies’ take is rather like mine - but when I tried to paste that post (with Phemies blue answers to points) the blue went away. So I’ll adopt Phemies method and use RED for mine.
I am a “Communion Service Leader” for the Diocese of Orange, bringing Sunday Communion to a few Catholic Children at the County Home (not a jail, yet part of Detention Ministry). This is a bit different from presiding at a parish’s altar. We have a box with a pyx (and Eucharist from a mass at a local parish), the readings of the day, a crucifix and other items to convert a common table to a working “altar” (even though it is not a mass).
I play music to support the Service most weeks, preside about once per month. We do have one woman who also presides about as often AND once per month a priest does say Mass for the four or five kids we get.
These “kids” aged between 7 - 17 would otherwise not have Sunday worship as the facility will not bus them to mass. And SINCE it is SUNDAY we do all the Sunday readings as well as distribute the Eucharist (so that “the kids” get as MUCH of the (Mass-like) WORSHIP as they can). We were trained, commissioned and are instructed by the Diocese (which otherwise doesn’t do many “Communion Services” led by lay folks).
The parish in question may have opted to do what they did so that people could still receive the Eucharist (

) rather than cancel it due to the absence of any priests.
I share some of the other posters’ concerns that such an occasional thing might become
the norm; confusion might ensue; or (God forbid!) the lay minister might prove to be more popular than the local priest (to name a few dangers).
That said …