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Originally posted by JeffW:

The takeoff appears, to a bystander, completely normal but with some xtra wheelspin due to the conveyor belt.
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YES! The plane still moves with respect to the air and with respect to the earth's surface.
If you are saying that to an outside observer looking upon the conveyor belt scenario that it would appear like a normal takeoff from start to finish relative from their viewpoint ... then there is a big problem with your perception of this entire discussion.

Your perception of it doesn't seem to be including the fact that the conveyor and the plane's speed have been matched exactly.

Once the conveyor and the plane's speed has been matched, the outside observer will see the plane as standing still whether it is or not.

Do you understand that fact?