It appears a lot of consideration was given to the dial layout and avoiding common modern chronograph pitfalls, such as sub-registers that are squished at the centre of the dial. It is really a pet peeve of mine. The use of the larger minutes sub-register reminds me of the Patek annual calendar chronograph, but the execution is much cleaner here. The dial is close to perfect aesthetically, but I do note the absence of fractional measurement ticks near the 30 second mark.
Chunkiness is another common pet peeve with mechanical chronographs, so I can appreciate your threshold for thickness. The power reserve was an issue with the original DB 8. It has been increased from 38 hours to 60 hours.
It looks to me as though the movement is sitting in stylish movement ring, such that DeBethune could later use the same movement inside a smaller case, with a smaller 30 or 45 minute sub-register. The brand has a track record of listening to its clients, but I'd have a hard time passing on this one to ask for a smaller diameter.
My impression is the updated DB 8 is functionally and aesthetically improved over the original. By a significant margin. If you missed out on the original, regret has turned into opportunity. For those who complain most of the watches today seem to be looking back on their history, this is a stylish and thoroughly modern dress chronograph.