When I change the product name, why doesn’t the name shown on the listings page get updated?
The listing title is generated when a profile is applied the first time – that is, right after you selected your products and did the “prepare listing” step.
At this time, the title prefix and suffix are applied and any shortcodes such as [product_category] are replaced – that gives you the actual listing title when you view the Listings page instead of placeholders. And it allows some users to edit the generated listing title and as they like it before they actually list the item.
So while price, quantity, attributes, etc. will be automatically update when you change an item, the listing title will only be regenerated when you select the items and choose “Re-apply profile” from the pull down menu.