Ask HN: SEO impact of HN's URL “itemid” vs. an actual title?

What is the reasoning behind only an itemid in the URL for HN? Is there an SEO impact? For instance, a url on reddit may be: https://www.reddit.com/r/askscience/comments/4ea7ee/what_would_the_horizon_look_like_if_you_were/ while a link on HN looks like: https://news.ycombinator.com/item?id=11465163