It's honestly confusing, seems janky, and I don't understand how the post aggregation works at all (I want my "front page of /r/all" equivalent). However, it's all better than continuing to support Reddit. Digg-->Reddit-->Lemmy-->???.
The front page of r/all equivalent is by selecting all rather than local and subscribed? I am not sure what you are missing. It doesn't aggregate it to its own page but it is effectively the same thing.
I'm selecting all and sorting by hot, which is the closest I can come to, but there's so little activity compared to Reddit's algorithm. Here's to hoping for more activity!