Not sure what you count as a 'blog', but internet discussion fora even vaguely similar to BAUT are few and far between, IMHO ... provided you exclude those with almost no traffic (cosmic variance has already been mentioned).

The closest I know if is PF's Astronomy & Cosmology section. If you have the appropriate academic credentials, you could ask to join cosmocoffee.

More down market is the NSL (Night Sky Live)/APOD forum, The Asterisk*.

Daily Brew may also fit within the desired scope (just).

To suit what I understand to be Ken G's taste, though not explicitly about astronomy, I would recommend, quite highly, the HPS (History & Philosophy of Science) section of TGL (The Galilean Library).

*Some readers may know, or be interested to know, that "Nereid" is an active participant in The Asterisk and PF, and a somewhat less than active participant in TGL.