We are talking about American-built products on an American-built website. I think people would happily use metric units when talking about foreign products on foreign websites, but for some inexplicable reason, these are much less often the center of the conversation.

There are tons of European defense tech start up right now in Ukraine e.g. Donaustahl , Vector.

Somehow some HN readers from America ignore these startups. Instead they insist on outdated units. Oh boy, there are dedicated Reddit subs for you.