I think I have it.
I have figured out what “feels wrong” to me about, say, Tom Booth “Find Us Ready” at Mass, or even just “One Bread, One Body”:
here it is.....
What is at odds between some types of music and the nature of the liturgy is the lack of formality present in the environs that society associates with the music’s characteristics.
Even a cursory glance at the Roman liturgy will reveal a great deal of formality in these rites. Almost everything is structured and planned. Vestments are described in the documents with words like “dignified”. Even the materials to be used for the vessels are specified.
In how many environments in American society do we find guitars in use in formal environments? Some, to be sure, but they are the exceptions rather than the rule. Guitars are “cool”, and formality is rarely “cool”.
How many people would hear Tom Booth’s “Like the Bread” and think of something as formal as the text of the Gloria? (And even the current English translation uses language quite far removed from everyday speech!)
It’s not a value judgement of the music, but these are sounds that don’t really accord, in our society at least, with the formality of the liturgy.