Oops, my mistake. Sorry to be a pain! Is there a reason why something reasonably substantive like this which addresses both a specific query from users (nested

Oops, my mistake. Sorry to be a pain! Is there a reason why something reasonably substantive like this which addresses both a specific query from users (nested) and apparently at top level to shouldn't be allowed? I guess upvotes are an imperfect measure but this post appears to be contributing more than many other top-level comments. (Thanks for taking the time to explain! Either way consider me corrected.)