There might be a case for a more sparse content feed. Sure you can subscribe to hundreds of communities across a hundred different servers but you are more in control of the feed. every post is going to be more relevant and you will have more incentive to take part in conversations instead of just refreshing and having a whole new page of crap.

There are some ease of use improvements to be made of course, this is the most users and fastest growth lemmy has ever seen, so there is some learning to be done as it scales.