http://www.thelocal.fr/20170105/can-frances-new-right-to-disconnect-change-life-for-workersNot a bad intent but 'lol France thinking it rules all problems by making laws for everything' at it again.
Moreover outside of the really not obvious way to define anything really clearly concrete about that, limiting it to 50 and more employees companies kinda misses the point, cause the biggest a company the most an employee has some rights and ways to express itself already, some other big European companies already having set policies about that, while in small to very small businesses work pressure can be far bigger and far more difficult to complain about.