The memory anchor is the product name though. I go back to PH often to find products I didn't have time to check out and to jump back into discussions, and the product name is the thing I'm looking for. I can find it in seconds, and I can also see how certain products have moved up the leaderboard in seconds. Sentences as the visual lead would greatly complicate that behavior, one I think is a primary one.

Said another way, the atomic unit is product names, which I actually think is more effective than the Show HN model. Some tagging/categories would really help overall, but I think this design actually helps beyond a cursory first-glance at the homepage.