I think that the original questions mixes up two different issues.
First, is the issue of what minimum combination of movements is necessary. It's worth knowing that if a camera has the correct minimum combination of movements, it can duplicate, by "indirect" movements, all the movements on a more full-featured camera. Examples of combinations that allow full "indirect" movements are (1) front and rear tilts and swings (2) rear tilt and swing and front rise, fall and shift (like the Eastman Commercial 8x10) (3) rear tilt and swing and front rise, fall, tilt and swing (like the Deardorff). Modern field cameras that allow every possible movement on both standards are a convenience but not a necessity. You do need some movements on both the rear and the front to accomplish this, however.
The presence or absence of yaw is a different issue which has to do with whether movements can be made independently or whether making them in combination affects one another. It is mostly important in work that requires a high degree of precision, such as table top photography. Landscape photographers generally don't worry about it, and all traditional field cameras have yaw.
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