I looked at the sample pages, and agree with much of what he says about interpreting the hymn music to be played on the organ. I was an a RSCM dinner last year and a retired organist lamented to me that so many young organists these days are completely unable to lead a simple congregational hymn.

I think part of the problem is that many organists don't sing. I don't mean that they should sing the hymns whilst they are playing, but a good understanding of basic singing technique greatly helps.

A prominent organist said on his blog: "If you can't play a hymn, you can't play jack." and I think this rings absolutely true. Congregational hymns are bread-and-butter music for a parish organist. Chant, Motets, Organ Solos are the peanut butter and jam.