Dnk, specs are not always for performance, alot of the times I see this in specs, it is basically for neatness or asthetics.
Now as far as performance is concerned, let's take the "Choke Effect" out of the conversation, and think parallel conductor.
When the metallic raceway and GEC are bonded together at both ends they become a parallel conductor reducing the resistance and impedance of the path, so with this in mind, it would make sense to bond the raceway and conductor regardless of any other considerations.
Roger
