In the context of the celebration of the Holy Sacrifice? Not so much. At least, the interior of St. Peter’s basilica, the High Altar at Monte Casino, etc., etc. disagree with you.
St. Peter’s is not a monastery, and Monte Cassino is the exception, not the rule. I spent a week at Sant’Anselmo in Rome last November, the monastery that is the teaching college of the Benedictine Order, and I can assure you that there, and any other Benedictine monastery I’ve attended, things were nowhere near as ornate as at Monte Cassino (which by the way was until recently a territorial abbey and the abbot, was an “abbot nullius” who fulfills the role of bishop for the territory; it was still a territorial abbey when I took that picture in 2009 and when I visited again in 2013). Many Benedictine monks I know are, in fact, scandalized by Monte Cassino’s decor.
I’m not calling into question that there are other ways to glorify God than fancy vestments and vessels. But in the context of the Mass, we are always to give God our finest.
There is a reason why Rome forbade the use of the earthenware chalices that became popular in the 1970s and mandated that every chalice be lined with precious metal. This is because, objectively speaking, some materials are better than others. Gold is a more fitting vessel for the Precious Blood of Our Lord than is pottery.
Bronze is acceptable as well; part of the reason for more noble materials is to prevent spilling of the Precious Blood.
But doesn’t the total oblation of one’s total self require that one totally give God everything that he has? Wouldn’t one in such a state desire to glorify God through a beautiful and reverent Liturgy? I am not saying such a Liturgy requires superfluous amounts of gold, tassels, etc., but certainly - as tradition makes clear - a certain level of dignity in the trappings used (which the Monastics (at least the ones in the photos you provided) seem to display, so no disagreement from me there).
Individual monks do not have anything material to give. Everything belongs to the abbey and monks do not own property (even vestments) in private. It’s not an individual priest-monk who decides what vestments to wear, but the sacristan who decides for everyone. Note that I am not advocating poor-quality vestments. Our abbey’s vestments are of excellent quality and well-cared for though for the most part plain and understated. They do have more ornate vestments; liturgically, though, the Solesmes congregation tends to adjust liturgy (and vestments) to the degree of solemnity. The abbot for instance, only wears the mitre and crozier on the holiest occasions, but not on Sundays. Similarly on ordinary ferias or memorials, there’s no organ, no incense, and simpler chant tones for the preface, etc.
Their liturgy though, is beautiful and appropriately reverent every day of the week. Gregorian chant, in Latin (Greek Kyrie) is used for the Propers and Ordinary every day, and the only non-chanted parts of the Mass are the homily, and the intercessions on weekdays (they’re chanted on Sundays or solemnities). Everything else is chanted including the readings, and the Gospel is always chanted by one of the deacons.
There are times though, such as simple weekday Mass, when plain and humble is preferred. After all what meaning would a solemnity have if every day was celebrated with the same degree of solemnity?
I don’t think you’d find anything irreverent about the abbey’s liturgy on any given day. They do give the best of themselves… in this case not overly ornate decor and vestments, but in the quality of their liturgical actions and chant.
Also note I’m not saying that ornate vestments are per se wrong; I am saying that the tradition for more subdued vestments (and architecture for that matter) has been around for as long as the Church, and that it is a perfectly legitimate representation of Catholic worship. The Church has far more traditions than what one typically sees (or saw prior to Vatican II) in parishes or cathedrals.