Well, I've broken Elixer G strings, but can't really say with any more frequency than Dean Markley or others (For some reason, I;m always surprised when I break a string). I'm generally running .10 to 42 gauge strings with a jazz style pick. I am inspecting the picks more closely as their wear can sharpen the pick and cut the string.

Regarding your fingerpicking friend, that is baffling. Perhaps a direct inquiry to elixer regarding their core?