I would suspect no room in nearby footway boxes, or no planning permission for a new box. If you look at my reply to WWWombat, you'll see that is a DP, not a splitter.
Photo 5a, did you notice the two E-side DACS units in the cab, guess you could now have a DACs'ed line AND broadband !
Photo 18, this is the BFT with the addition copper pair in it, hence the under eaves closure and the original drop wire taking the original feed in.