PaulK: "...no hope for anything more complex"

That's unduly simplistic fatalism. Its rather trivial to track QBO angular motions, the phase-angles of the rotating "balance wheel" components with respect to longitude. Balance-wheels indeed have inherent wavelengths >0.

Simply assume Taylor Frozen Field Approximation for East <=> West QBO motions, then plot them with respect to the surface (longitude).

Consider a tire spinning in place on ice. One could only assert it is motionless (zero wavelength) by disregarding its angular velocity.

I do not give up hope we may agree on such basic truth. To lose hope would be "punting".

That's unduly simplistic fatalism. Its rather trivial to track QBO angular motions, the phase-angles of the rotating "balance wheel" components with respect to longitude. Balance-wheels indeed have inherent wavelengths >0.

Simply assume Taylor Frozen Field Approximation for East <=> West QBO motions, then plot them with respect to the surface (longitude).

Consider a tire spinning in place on ice. One could only assert it is motionless (zero wavelength) by disregarding its angular velocity.

I do not give up hope we may agree on such basic truth. To lose hope would be "punting".