It's not a silly definition. it's the definition. And it make far more sense than saying people are part of a community simply because they happen to have the s

It's not a silly definition. it's the definition. And it make far more sense than saying people are part of a community simply because they happen to have the same overlapping values, even if they've never interacted with one another. The whole point of a community is that it's where people interact with one another. A neighborhood is a community. A commercial area you choose to shop in is a community. A forum is a community. A subreddit is a community. HN is a community. Not every person in each of those locations have the same shared ideals and values, though they likely have some overlap since they each choose to be in that location.