Main benefit would be easier navigation and consistency if you are using wowhead (or similar sites) in a different language. Now it have to switch wowhead to English, search the item by name and only then see the detail page, with the change I could just copy-paste the ID into an item link to switch to it.
Example for Linen Cloth: From "https://classicwowauctions.com/everlook/alliance/item/47" as it is now to "https://classicwowauctions.com/everlook/alliance/item/2589"
Main benefit would be easier navigation and consistency if you are using wowhead (or similar sites) in a different language. Now it have to switch wowhead to English, search the item by name and only then see the detail page, with the change I could just copy-paste the ID into an item link to switch to it.