>>64253610
I thought I had an image of the hunter-seeker dart weapon from the old movie used for the assassination attempt against paul.

That said, it's not like shields are the end all, be all:

1. While their life-span/energy usage is never really brought up in the book it's assured they probably don't last for a very long time.
2. No mention that you can adjust the permeability of the shield on the fly.
3. To make the maximally impermeable would mean having some kind of life-support system and that's probably something a man-portable variant can't sustain for very long.
4. The invention of weapons that can move below the speed of typically designated weapons to bypass the shield.
5. Tactics to incapacitate shield users such that they are stuck and have to keep their shield up allowed for point 4 to still be in play.
6. Going back to the point about life support systems; poison and biological weapons/hazards come back into play.
7. There is nothing that says the blastwave/shockwave of ordanace won't still hurt/kill you.