There are so many complains about the music because people keep repeating the same ridiculous half-truths over and over again: chant is too hard, we should sing music people enjoy, we can’t get rid of a 40 year-old tradition. Then when the facts are presented–from the authoritative documents of the church–others clamour that they are “opinions” and this also is allowed to become the worst half-truth of all.
The whole tradition of plainsong includes multiple versions of the same texts, not just one or two, but many. Some Gregorian Chant is very, very difficult, and requires trained singers with some time to rehearse. I’ve sung things like this, but I’m a trained musician, singing with other trained musicians, with rehearsal time. There are entire bodies of plainsong that are simple. The “toni simplex” (“simple tones”) and psalm tones are quite easy to learn, and between the two all of the music of the mass can be accommodated. In fact, the ordinary of the mass is included in
tonus simplex in every missal that includes the new translation. It’s very easy, and it’s in English, so you cannot even complain about the Latin. The psalm tones are simple enough that they can carry all of the texts of the propers without any problem, although it would take about half an hour to prepare them every week. Then again, there are websites that provide that for free, so you could just download them.
Plainsong was not originally accompanied. This is true. On the other hand, the organ was introduced into the Western Church at a point when plainsong was the only music we had. That is to say that the organ has accompanied chant for as long as the organ has been used in the Catholic Church. There are numerous accompaniments available for free, and the simple tones do not require many chord changes; you could easily improvise your own accompaniment just based on three or four chords.
The range of the simple tones is not very wide; in fact anything larger than an octave was considered unusual for the entirety of the chant repertoire, and the simple tones often only use a range of a sixth. Since this music has no fixed pitch and can be moved to any key, it becomes very unproblematic to sing it. Perhaps not all liturgical musicians are sufficiently trained to transpose music, but it is not difficult to do, and it could easily be made available if there were enough cry for it. I have seen pop music sites include the ability to transpose the music to any key; there is no reason why a site full of chant and chant accompaniment could not be created to do the same. The fact that it does not presently exist is not really relevant; it is not a large undertaking to do that, if the church were interested in making it happen.
As for people not liking chant or the fact that reintroducing it confuses people because they haven’t heard it in 40 years, it’s completely irrelevant. The church has been clear and consistent for more than 100 years that chant is the proper music of the church. This is clear in all of the Vatican documents:
adoremus.org/Actionsofholysee.html. It is also clear in the new version of the GIRM:
usccb.org/prayer-and-worship/roman-missal/general-instruction-of-the-roman-missal/
The desire to use chant is not my opinion or the opinions of the other posters on this site that have said it should be used. It is the Opinion of the One, Holy, Catholic, and Apostolic Church.