Bleeding Cool has been following the comparison between Marvel and DC on the manufacture of their hardcovers, and managed to wring a promise out of Dan DiDio that DC's process would be improved in the near future. And with New Teen Titans Omnibus Vol 2, it seemed that this was indeed happening.
And with the Jack Kirby Spirit World Hardcover, it looks like this is now standard practice for the publisher. Stitched pages, sufficient margin gap. here's an "unboxing video" to prove it.