It's not a clear-cut to me. The scrollable design has its own usability problems if you look closer at the Docker page: multiple access paths, content spread, a

It's not a clear-cut to me. The scrollable design has its own usability problems if you look closer at the Docker page: multiple access paths, content spread, and more often than not people just don't notice there's a scrollbar (with 16:9 they are so tiny that a distracted visitor may not notice it). You can tell that the designer of the Docker page had this problem because you see three times "What is docker?" on that page, two of them being actual links.