A parish church is the most suitable site for a wedding.
Look, guys, in the early Middle Ages and before, it used to be that (outside of emergencies), you couldn’t be baptized even in most parish churches! The preferred place for Baptism or any Mass was the Cathedral, of course, so you’d be all in union with the bishop. If a big town didn’t have a cathedral, there’d be just one baptizing church in that town’s whole area, the “matrix” or mother church. Why? Because clear knowledge of who was baptized, and unity of all the Catholics in an area, were more important than convenience. And this was in a time when they didn’t have cars.
Churches didn’t originally do weddings, although marriages were always regarded as sacred and inviolable (as per Jesus).Weddings were always supposed to take place with lots of people present, in public places in the middle of population centers, however, so that there would be lots of witnesses and no way for either party or their family to claim that the wedding never happened or the wedding contract was void. Frankish kings and lords were really bad about trying to back out or lie or have polygamous situations, so the Church started to get into the business of witnessing weddings. Weddings were held in the front porch of the town church, where everybody in town could watch and no shenanigans could take place, like people running off with the dowry or the bride’s betrothal gift from the groom, or kidnapping the bride. Eventually things moved inside church, and more prayers or a whole Mass were added. But it was still vital to have nothing secret or totally private; there had to be witnesses.
Nuptial Masses and the special Nuptial Blessing also became a really big thing. In a time when Communion was something you received once a year, it was also very special to be able to receive Communion with your spouse, and to come inside the sanctuary and onto the altar area to do it. All newlyweds who were married in the Church represented Christ and the Church in a special way, and tying that to Mass and their parish church building was also very deep.
Parish churches are now the places for weddings and baptisms, because the rights of the bride and groom still require witnesses that can be found, and good records at the parish level. (With good copies at the diocesan level, in case of fire or other mishaps.) Having a wedding “someplace pretty that is not near my town, my family’s town, or my spouse’s family’s town” or “someplace faraway in a nice vacation spot” is basically begging for records trouble and future injustice.
In this case, the bishop and the parishes are very kindly going to a lot of trouble for the sake of these couples, and I’m sure it’s to their credit. The records will be taken care of. Probably nobody is going to abduct any brides or steal the wedding gifts. But it’s still weird… and a little impoverished. Especially when nobody has ever been stopping anybody from having their receptions outdoors, or their honeymoons outdoors.