A few points:

-I feel like even this short guide is overcomplicating it for 90% of potential users. Just add a tl;dr at the start about checking out the relevant settings (top bar, notifications), subscribing to magazines, and navigating to the "subscribed" feed. Like, if I want a hot shower I don't need to know where the water comes from or how pressure is determined by the bermoulli formula, just say what do I press to get the water to come out hot.

-Explain that collapsible comments are coming and there's a userscript for people who are into that.

-I don't think that this separation of tiers is efficient for anyone. Like, if I want to know how to see the local feed is that lurker or addict.

-I think it's overcomplicating threads and microblogs. Yeah, I didn't know there was a difference between replies and comments but it's never been relevant for me this past month. One is like reddit and is compatible with lemmy, the other is like twitter and lets you talk to mastodon users (and misskey, and calckey,...).

-On that note, some people get overly confused with the concept of federation (in part because people usually overcomplicate it when explaining), and this problem is compounded on a platform that also interacts with instances from other platforms. You can just keep it simple and say "you have an account on a website which has its own content. There are others that look exactly the same with different users and content, but you have access* to all of that too".
*unless admins decide to defederate specifically from your website, like what beehaw did.

Ironic that I said to keep things short and then wrote a huge comment.