[Edi]

Reverse communions are a bug that turned out to be a feature in the bigger picture. It is not working exactly as it was originally envisioned, but it is not really breaking any game mechanics or causing out of bounds errors, as it were. Plus it's available to absolutely everyone with astral magic.

But MoD, force marching, sneaking out of sieges with non-stealthy units, haven't really seen anyone but K advocating those as acceptable tactics. All three happen to be red or violet bugs.