paddle mass and speed

pnachtwey wrote: There is no point in getting a heavier paddle unless you just like the feel

Perhaps if you are only considering the physics of the blade, but a lot of people like the feel.  I think it is because proper timing of the swing and backswing means fewer mish*ts and hence better shots.  There is also a neurophysiological principle at work.  If your blade is too heavy, you are using larger "motor units" (defined as a spinal motoneuron and all of the muscle fibers it innervates). As you increase the strength of a contraction, you gradually recruit larger and larger motorunits, so the gradations of contraction--the bit resolution as it were-- get steadily larger.  That is why when muscles are very heavily loaded and you need to use almost all of your motor units to lift or move an object, you have almost no motor control and you tend to have tremor with any fatigue at all.  This means that if your blade is too heavy you will lose fine motor control.  If the blade is too light, you will have very fine motor control but the lightness may well result in a tendency to rush your stroke, not hit the ball on the sweet spot of the blade, and then you are messed up.

Professional players (shakehands) almost always use blade that are 85 grams or more and they use maximum thickness and often quite heavy rubbers.  They do not use the ultralight  blades some companies sell.