Ahh… I think now I understand. So basically when wordpress sees the URL that doesn’t have a postname or post id, it displays a page intended to show a list of posts, which doesn’t include comments. Right?
Boy, it sure would be nice if WordPress did a tiny little bit of permalinks validation, or was a little more flexible about them (or at least had an explanation of this in the Permalinks doc page)… the “custom” panel sure gives the impression of great flexibility (that isn’t there), and the resulting behavior is not something that a newbie like me would expect. I’ve wasted more time on this specific issue than anything else. I guess I’ll go try to figure out how to submit a suggestion…
Kafkaesqui: thank you SO much!
-R