This has been reported here a fair number of times, and I cannot find either an opinion or a solution.
In earlier versions, if you used popup comments, after a user posted a comment the popup reloaded but with just the comments / comment form in there.
At some point in 1.2 (?) this changed and when someone posts comment into the popup, the full page (essentially an archive views) reloads into the popup.
(1) Was this change intentional
(2) Whatever the answer to (1), how can we make this change go away in 1.2.x and 1.5