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Here we go....the thrust (coming out of the back of the engine) is to push the plane forward at speeds great enough that the air speed over the wings creates lift, in this case the conveyor belt does not allow any forward movement and therefore no take off.
If the wheels are unimportant, why does nearly every plane in the world have them. They are an essential part in allowing the plane to travel forwards.
But the conveyor isn't acting against the thrust of the engines. It's counteracting the speed the wheels are rolling at.