[MarkMMullin]

Purely by inference based on ML/MV interactions with various bits of teh Googz, it will depend very much who is asking these questions - the closer you get to the tensor processing unit and its enclosing code, the more you're going to have to really know your stuff - further away in some of the ex-moon shots struggling to survive, I'd personally be surprised if the staff runs a reliable enough A* alg in their own heads to actually get to the room you're seated in - in short, googz is big - closer you get to the core the more hard core I would expect it to be, conversely as you move to the fringes, well that might be what you get :-)