The OP obviously took the E190 flights. I am not sure how you could generalise this view to all of DJ's business service.

It's either you have never flown DJ before or you fly QF rarely.
QF sells a business fare but offer economy seating in many cases. Out of the dozen or so flights I took with QF last year only 2 had proper business seats. And don't get me started with their 'tasting' platter they serve on their short sectors.

DJ's E190 seats are wide and comfortable. It's a narrower body than the B737 and DJ hasn't really worked their business product to these planes (even though something is in the pipeworks).

Now seriously, how much did QF pay you to post this?