[purerandomness]

If you're bookmarking a directory, a list of things (e.g. the HN frontpage), you expect the content to change when opening the bookmark.

You bookmark a link to the directory so you don't forget the directory's entry URL.

The use case the author is talking about is a different one: You are configuring a complex item in a shop, and want to bookmark the URL so you can save it, recall it later, share this configuration with someone, or compare it with a different URL.

In this case, you also would expect little details to change (pricing, descriptions, photos) but the structure of the state should stay the same.

It's very frustrating when you share a link to a product detail page, only to discover that all your filters and configurations have been lost.