Even at the most basic level it is broken - at the bottom of your comment is a “context” button with the fediverse symbol. If I click on it, it won’t take me to the comment on my instance (lemmy.world) but instead is an absolute link to the comment on your instance (Aussie.world) even though the community lives on lemmy.world.
I love lemmy, and I think it has a bright future, but this fundamental problem really needs to be fixed.