I started this post after reading that thread and I understand how the gearing affects flywheel and distance. I have been intentionally using harder gearing overall to allow more focus on cadence during workouts.
Let me ask a different question;
What the difference between distances calculated via Strava and the distances recorded by Zwift?
You mention a potential physics model for speed in the future; does Zwift have a model in place that more closely represents distance?
Is there or could there be a way to correlate flywheel speeds and power to representative outdoor speeds? Is that what is meant by ‘physics model)
(This rabbit hole is deep isn’t it?)