I interpret it exactly the reverse; it seems to me like that is a locking mechanism designed to
allow for a rotating head, not that the head roatates to accomidate the locking mechanism. Besides, even if the tabs are lined up, one still has to remove the name tags before one could depress the tabs, and even with the nametags off, it'd still take a paper clip or better to depress the tabs properly. The head's not coming off except on purpose or by blunt object

.
And I'm not sure I buy the idea that it's simply a cheaper way to design a microphone head attachment. It'd seem cheaper and more straightforward to me to just thread the body and screw the head on like everyone else does than to have to design a freely-rotating head with seperate collar ring, locking mechanism and removable nametags.
Ah, who knows. It's certainly not something worth discussing much further. And I'll bet a buck that there are very few people at Shure that are anywhere near their customer service department that actually know the real answer. I'd give even money that 5 calls to Shure customer service will yield two or three different answers. (I'd really like to be proven wrong on that one

).
G.