In my opinion too stiff a handle and you risk shoulder splits (assuming thin shoulders).
Need a good balance.
I would argue the complete opposite tbh, I very frequently have rehandles in that are 5 spring or 12 pc handles (the whippiest handles currently on the market) although admittedly the handles were of poor quality, thin, and the shoulders were also thin, so I guess it's a combination of factors!
My main reasoning for thinking the opposite though is that flex above the splice causes torsion forces on the joint, which is why I would always try to mitigate this.