I don't care about the film size. When I think of large format, I think of view cameras. I have owned a 5x7 point and shoot (Hobo) and it was very far from my view cameras (kept the lens and sold the body for what I paid for the both, which was the reason for buying it). When I shoot 6x17 or 6x12 on my 4x5 I think of it as large format because the camera setup is the same with the possibility of full movements. I imagine if I had a 6x17 that used a focus helical it wouldn't feel like large format.
To me it's the camera that makes LF. To others it's the film area, and to others it's the use of sheet film. I say don't worry about it and buy the camera you want, irregardless of how other people label it.