I am aware of what Vd and Md are (hence the reference to CS 25) and I’m interested in what the real boundaries and capabilities of the aircraft I fly are. Knowing the aircraft has been flight tested well past Vmo and Mmo it would be nice to have an idea as to where those boundaries are as the aircraft must demonstrate satisfactory handling qualities within them.
It’s not obsessive technical detail to know for example that the design load for the gear is 300fpm at MTOW - again, excitement levels will be lower when something goes bang. Most of the really interesting accidents and incidents involve the kind of cascading or multiple failures we don’t and can’t train for. The more basic knowledge one has about the aircraft and its capabilities the better prepare you are, particularly in the modern world of FCOMs for dummies.