The submission title is the article title, and submission guidelines specify to use the original title (with some caveats). Hacker News also has a large US cont

The submission title is the article title, and submission guidelines specify to use the original title (with some caveats). Hacker News also has a large US contingent. While that doesn't mean everything should be converted to imperial units, it also shouldn't be surprising when they show up. I wouldn't expect people to modify their units in this way in either direction, frankly. As you mention, it's not that hard to find a place that does the conversion, and it's also not that much harder to become accustomed to having a ballpark feeling of another unit system.