These are those types of things that are a little silly to debate. There is no grey area here: If the engine turns at this speed, and the gearing is set up with this size front sprocket, this size rear sprocket, and has the standard tire size, the final speed is the output of a simple formula. Experimental testing implies that these things aren't inherently obvious, which means some of us are missing the point in the first place.
www.gearingcommander.com will provide all of the information we need to play around with sprocket ratios on our bikes, given a normal size rear wheel. Every other variation that people might see on their individual bikes is due to measurement error (inaccurate tach, inaccurate speedo), or in very rare cases, a slipping clutch that lets the engine turn faster than the rest of the drivetrain as it slips. That last point is extremely rare to cause one of these ongoing issues, as the slippage would be variable and change with throttle position; not the usual behavior of when someone reports these measurement issues.