About the tries:
* Teams becoming more competitive. Italy no longer concedes 80 POINTS when playing England and co. for e.g. That's the obvious argument.
* Teams playing more conservatively. Defenses are tighter, this year is a great example of great defense being played by every single team in the tournament, all 6 nations, save a few games where one team just never got in the match (ENG SCO, SCO ITA...). I think coaching staff and authorities realized the importance of defense perhaps taking note from the English, and have become much more realistic. It's just an empirical science, if you want to win, play conservatively: use your scrum, work on your defense so that it becomes impenetrable, and then kick in some penalties. Nations realized that vision was more pragmatic and realistic, since after all the only goal is to win games...France itself known for its flair has played very conservatively the past few years on certain occasions unfortunately...