Might I point out that this is not the right Forum for this? It is important. Accessing from abroad on very slow connections, R & N is often the only place one can visit in the time available- better it's kept for what it's for.
So, the point you are making is when all else is failing around you, artificial horizon with nothing but the makers name on it, fire in the ceiling, other crew calling out 'what's happening', any pilot worth his salt would latch onto the one instrument that will save everybody.......a turn and slip indicator? I don't think so.