About the post tags…it was all pretty much just lifted from reddit since that is the system people were most familiar with at the time. By now, I think it is fair to reevaluate and figure out what makes the most sense for our use case and scale. Lemmy 1.0 (when that finally gets released) is planning on having support for piefed/reddit-style post flairs, so that can hopefully serve the role of these tags more formally.

One thing that I do like from your list is the switch from RT/WT to just a more general recommendation tag. RT/WT aren’t very clear or easy to guess what the abbreviations mean unless you are already familiar with the culture coming from the subreddits or have read the sidebar (which isn’t always easy to view depending on the app you use). I do think that keeping it shorter is probably better, so maybe something like [Rec] like @ReluctantZen@feddit.nl suggested might be best.

DISC/Discussion is tricky. I agree that discussion as a topic is pretty broad and can cover much more than just chapter discussions. However, this is a tag that is so ingrained in the muscle memory of people it might be too hard to dislodge. I suspect that this might be a case where the tag in the post title might end up staying as DISC, but we can create more fine-grained post flair once lemmy 1.0 comes out to help people filter and categorize more.