One real issue with the nightly/stable split is that it hasn't been entirely clear when things will actually be making it into stable. I understand that software development is full of uncertainties and sometimes you just don't know how long an implementation will take until you actually build it. But right now, to someone not involved in developing Rust itself, it's hard to get an idea of what the nightly-only features are, where they are in the stabilization process, and when they might be expected to appear in stable. For a concrete example, I only found out that custom derive will be out in 1.15 because I happened to read Hacker News. And there doesn't seem to be any index of RFCs or where they are in the process at all, or at least not anywhere that I could easily find. In the core team's defense, they're eyeballs deep in this stuff all day every day, so they have a pretty good idea about what is where and how far along things are. But us users who only glance at what's in each new release and only upgrade every 6 months would really like to know whether to bother to bother installing nightly for the shiny new feature or just wait for the next release that will have it and be actually stable.