Is it your opinion that a mechanical connection is not required ?
It is mine. No more than the same cable running within a metal stud wall. The cable is listed as a complete assembly and can be installed in any of the ways permitted without any further attention.
Now, when you strip the armor or sheath where the cable enters the raceway that all changes. You no longer have that listed assembly, you have individual conductors much like the cable entering a box or a trough. You have to use a suitable connector at the point of entrance to the raceway as well as, if you are using a metallic raceway, insuring ground continuity from the box to the raceway with a connector for that raceway.