An endangered species, to be sure, but there is hope.
The Church has produced, in recent decades, many of what I call "heuristic" "liturgists."
Luckily, this chapter is fast closing as we now witness a return to authentic liturgical scholarship.
This scholarship adheres to the most punctilious standards of academic exposition, as seen on the New Liturgical Movement blog.
You can read Gregory's fine works on the NLM site.
Happy birthday, Greg!