I kinda agree with him on quotation marks. My KJV Bibles don't use them - the capitals and comments around the quotes are plenty to show what's happening. Of course the red letter sections are clear for that reason too.
In a novel with more dialogue, they do sometimes help make it clearer, but then sometimes it's hard to keep track of who's saying what. I sometimes go back and count statements when it starts to not make sense.

