I hadn't thought of this before but I guess this is why I wouldn't consider the PK rackets as "dampened" which is more what I'd describe as the feel of a string dampener.
You still feel the vibration normally but from less overall shock?
When the ball hits the strings the impact bends the racquet frame backward and when that bending wave gets to the handle it slams into your hand, travels up your wrist to your elbow, etc. This first wave is called shock. Once that first bending wave hits the bottom of the handle it "bounces" back up to the top and then back down again at a frequency of 150-180 cycles per second. All subsequent cycles are post-impact vibration, the buzz you feel in your hand after the ball has left the strings. PK tech absorbs that first impact shock but doesn't really do much for the vibration that follows it. But minimizing the first shock will change the vibrations that follow. So the entire feel is different than a normal racquet but the tech is designed primarily to reduce impact shock.
This is the perfect tech for stiff racquets because stiff racquets ordinarily transmit lots of shock. But stiff racquets actually vibrate less after that first shockwave, so when you add kinetic/ionic tech to a stiff racquet you get less impact shock and then less vibration afterward because the frame is stiff.
Kinetic/ionic tech would be less useful for a flexible racquet because flexible racquets, because they bend more, transmit less impact shock. But after that first shockwave, flexible racquets actually vibrate more than stiff racquets because they bend so much. So the impact bends the flexible frame backwards a lot and then the frame vibrates back and forth a lot afterward. Since PK tech doesn't do much for that post impact vibration, and because flexible racquets already transmit less shock, adding PK tech to flexible racquets is kind of redundant. So adding the microbeads to a very flexible racquet like the Prince Tours won't really help because they are already so flexible and naturally good at absorbing shock.
An extreme example is wood racquets. They are so flexible, and heavy, that you hardly feel the impact shockwave at all. But after impact they vibrate back and forth a great distance. You can actually feel the tip oscillating back and forth in your hand after the shot. PK tech wouldn't do any good for a wooden racquet. But something like Volkl's skyscraper doodad added to the handle, which reduces post-impact vibration, would probably be pretty nice. Although it would mute the feel.
Wrote this fast. Hope it makes sense.