The problem of which instance to host a community on is a big problem for Lemmy.
Seeing the same content posted six times in six communities is a problem. It pollutes the feeds, it fragments the conversation, and prevents the natural death of low-traffic communities.
Seeing the same content posted six times in six communities is a problem. It pollutes the feeds, it fragments the conversation, and prevents the natural death of low-traffic communities.
Avoiding showing identical posts to a user separately seems like a very easy problem to solve.