You don't see this for the YC startups that have become very mainstream. Reddit is mentioned on a front page HN headline right now (https://news.ycombinator.com/item?id=19087558) without mention of its batch.
This is the second time I heard of instacart and it took me a minute to remember what they do (and the first time I heard of doordash), but reddit is much more well-known. Not sure it's that they're so commonplace.