The stiffness is effectively an excellent point to consider and maybe it influence the perception I have with a 400$ simulation yoke that, by nature, has a fixed stiffness.
I did some intensive tests tonight with the MSFS C172 and I can perceive a decrease of elevator authority near stall speed on the flare but it is very subtle compared to real life. Another factor I think must be considered is that the real 172 yoke elevator pull/push action has more travel than a simulation yoke. This travel difference is contibuting to the subtlety of the decrease in control authority.
having said that, I will get used to the idea that, as you said, the aircraft in the simulator have their own characteristics with which to maneuver.
Thank you for your comment!