I am the maker of the quilt top you mentioned. I tend to work in small pieces of fabric , typically one of the dimensions does not exceed 1 1/2 inch. So each "block" will have many seams . And not always knowing ahead of time exactly how I will lay out the finshed blocks , it will keep the bulk, particulary at the block joining seams, to a mimium. I tried a press to the dark and it never failed that some where in the quilt I had four layers coming together, creating a very think seam/bump. it is my opinion that over time this thick bump , will have wear from friction , and I noticed that the bumps on other quilters quilts appeared to loose color from the fiction wear at the thicker parts. Every notice the seams on your jeans , were the fabric wears out.
There are those who will say it creates a weaker seam over time but ... after 40 years of quilting and pressing open ... I have never had one seam fail.
It is a a personal preference to create a FLAT block or top... but over the years I have found that its easier for me to quilt and the LA pros seem to like/appreciate it as well. I just like it , others like pressing to the dark , go with what you like . try pressing a block with seams open and see if you like it.