Real World Light Boots VS Heavy Boots

[Lathrop and Sons Boots]

Do heavier guys generally need a more stiff boot? Lets say 235-250 lbs and a 40 to 60 lb pack?
thinking this because their weight and leverage on the boot will flex it more...

kind of what I'm asking...is stiffness somewhat relative to a person's size/weight?

certainly will be more supportive and stable for sure.