I was informed it is the cause of the strength glitches causes by opening WB with it enabled. I have not yet tested to see if the issue with WB persists in a game without Size Matters enabled. I should also mention that Raxxo said that issue was fixed, but if you look at
this thread, youll see I continue to have it at least as recent as SVN 11373 (after it had been reportedly fixed). Started to test it in a new game with SM off at current SVN but ran into the issue I posted about here pertaining to Revolutions. (Partisan Advisor button does nothing.)
You probably wouldn't have the strength glitch issue if you never open WB during a playthrough.
Edit: It is also possible that SM or even Worldbuilder for that matter is not the cause of the issues I have had. Never had that issue in previous versions of C2C so I don't know. More info about that is in the thread I linked above.