The first time I ever heard much about smurf it was from a Carlon guy doing a road show for inspectors. One thing he made a point of saying was that you need to hear 2 clicks when you snap on the connectors. If they bite 2 corrugations, they are not coming apart.
I do find it interesting that they amended around article 362 in California.
I am also curious why people think this offers inferior protection than Romex. For example you can use ENT in steel stud punch outs without a grommet. (although it is tough to pull through)
