Maybe it is a design feature intended to strenghten the sword/dagger area where the majority of blows get "guided" to a stop by the guard branches+blade.
A blow stopped by the mid blade can rely on a dampening effect, but a blow very close to the guard needs more strenght.
With swords and daggers the fingers were often wrapped around the guard .The ricasso permitted this [ where the fingers gripped the blade] without danger of cutting the fingers .
On Finish puukko's ricasso's appeared when they started being made by factories and they needed a place to stamp a logo.
It may have an old historic reason that got a different use over time
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