I am certain I won't change anyone's opinion on this point, but those are completely different things because the scope and the overall impact on the scene from the viewer's perspective are completely and wholly different. Visible attributes of an effect shot, such as a wire or unintended reflection are not the same aesthetically as a representation of an alien species or a set design, etc., etc. While Lucas may have the same feelings about the two items their impact on the viewer and presentation of the film are entirely different. Just my $0.02. - Walter.