I would love to see A/B testing on this. Change just for change sake. The comments form has so few inputs. Just like on this site. I see the "name", "email" and "website" inputs and I see the "comments". If I have a thought that I can't retain for 15 seconds, then I can dive straight down to the "comment" textarea (93px below) and fill in the other 3 fields after my thought is input.

Reality is, I suppose, if anyone wants to rearrange the comments fields after this change is in core, they can do it.