Earlier quoted context omitted.
The problem with Lemmy is that subreddits ("communities") are tied to a specific instance. So basically every instance has its own separate c/linux, c/funny, c/technology, c/anime, etc. This makes it really hard to use.
This is absolutely not true. As long as your instance is federating properly, you can follow communities regardless of where they are rooted. If your problem is in discovering the "canonical" community in case there are duplicates, then I'd invite you to take a look at https://fediverser.network
Sure, you can pick a random one like fediverser.network apparently does. Looking at one line from the list, I see that r/manga points to ani.social/c/manga which has 561 subscribers, when lemmy.ml/c/manga has 3,480. What?