I'm looking for arguments in favor of the ergonomics of flat ortholinear (grid-like) key arrangements, which seem to be by far the most popular among keyboard enthusiasts these days.
So far the comments I've seen seem to confirm my suspicions that even though they might have advantages in cost, simplicity, size, and aesthetics, they're just as bad if not worse for ergonomics than standard row-staggered keyboards (assuming you attempt to touch-type "correctly" on them).