I pretty much agree with everyone above saying "no" but I also think there is something to be said about the RPs with massive world building. Now obviously I am not a site vet, only been here for ten months according to my profile. Even still I can easily see what Roach means when they mention a certain vibe to each section. Just by looking through the section what I took away from it is they mostly have very involved world building, whether they are advanced fandom RPs or original settings. It's really cool to look through someone's world building document! In the casual section, there are also a few RPs with world building so massive it's linked to a separate google doc. When I see that even though I enjoy reading and at time being a part of stories like that, I also think "wouldn't something this involved have a better home in the advanced section?"

I also disagree that the RPs with pages and pages of lore to read through would make casual a fandom-only section. There are fandom RPs in all the sections, and for original RPs there are a bunch in casual that don't have extremely in-depth info docs. If post length is the only factor, then the section split seems fine as it is... but if you take lore and required reading into account, I agree that there are many RPs in casual that would fit well into advanced! For RPs that have been running for months to years, and have multiple story arcs completed, that's obviously a different story though. If those started in casual it's probably better for them to remain there.

I don't have a problem with the way the sections are separated now. The suggestion that Kuro linked seems nice if there ever were to be changes to the sections. Post speed linked with dedication to the world building project. So yeah, overall I agree with the above but I do think some RPs with very in-depth world building could consider advertising in the advanced section should they want to.