RVDT (and others)
What does weight have to do with the safety of an aircraft (in terms of certification)? Number of passengers, certainly- as the larger the number of passengers, the greater the impact (no pun intended) of an accident.
But weight?? Not that I can see. The weight limit for Part 27 used to be 6,000 pounds- was there any other change that was safety related when it was increased to 7,000 pounds? Not that one would notice.
In fact, for Part 29 helicopters, with less than 10 passengers, the H-V curve is moved to the performance section for that very reason.
Believe me - Transport Canada (and others) looked very long and hard at the rationale to increase the weight on the 429. I used to work there in the flight test certification section, and can tell you that there were times when our people had much more stringent requirements than the FAA. (not that TC is perfect, but they are well respected in the aviation world).