It's mostly about the fact that there is no official support channel, tooling, or documentation yet. JetBrains is working on it, but it's not coming soon. Essentially, it should work (as we use it in bundled plugins both at Google and JetBrains), but YMMV and if it breaks for your specific use case there are no guarantees yet — although of course we'd try to help, we can make no promises.