I really don't know how France tends to score Muay Thai fights, so I'm only guessing. But...France does seem to have probably the closest, longest heritage to traditional Muay Thai, so maybe they take pride in being more traditional? The one clue we might have is that the ref in the ring ran the fight VERY much like Golden Age fighting. More traditional than current day Bangkok stadium reffing. I really don't know though. We had a fight where the ref in the ring, and both fighters fought in a very traditional way, which was pretty surprising. I have no idea about the judges at ringside. I would say though, an org like the WMC can't really impose how judging is to be done. They can say how it is to be done, but people read with their eyes. I'm not really saying the scoring was right or wrong, given it was in the West. If you read my original post I tried to cover that.
No, just like with a kick, the "open side" (the side and direction the belly button is pointing) is the higher scoring point. If you are in orthodox, if you take strikes coming from your right, they score higher. This is for strikes that are unblocked by the shins.