@Romanos I think its that Gould covers notation, not publishing and house styles.
Speaking of house styles: Henle still uses lowercase letters for the modes. When they started their Urtext editions in 1948 the terms dur and moll were considered to be adjectives (from latin: durus = hard, mollis = soft). A-dur / a-moll were the common spellings at that time. For the sake of uniformity of their editions they stick with this tradition, although the Duden dictionary declared Dur and Moll to be nouns since 1958.
I guess in church music, by using just the letters, you can avoid the trouble, if a composition is actually not in major or minor, but actually in f.e. Phrygian or Dorian mode…
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