Thunder my opinion was also RCR's until she changed hers. I feel, well me at least the LBS SHOULD take initial time for themselves to regain their balance emotionally after BD and to read very thoroughly, everywhere for them to have an informed opinion.
Also, if there is an OP NC can be used as a consequence if the cake eating continues after a boundary was set and broken as an advanced tool pending on the sitch of course.
There are other boundaries that can be used first. Yet if a LBS sees no other way and has no other choice, I say do it!
I would steer clear of telling anyone what to do in their sitch.
That is how I saw RCR articles when I first joined and used NC accordingly. I found it very helpful and still use NC from time to time.