It's a meassurment method for static stability margin.
Not a stall identification issue. Not a feel issue. A positive stability margin not large enough issue.
As the CG moves aft, it reaches a point where the stick force per knot drops to zero, then reverses. This location is called the neutral point. The difference between the actual CG location and the neutral point is called the static margin. With a CG forward of the neutral point, an airplane has a positive static margin and positive static longitudinal stability. At a CG aft of the neutral point, an airplane has a negative static margin, is statically unstable, and requires some form of augmentation to be flown with an acceptable workload.
https://www.boeing.com/commercial/ae...y/fo01txt.html