>designed to deal with blaster bolts
Common pistols/carbines are one thing, but… We have seen a single hit from high-powered blasters (like Han’s “Imma outlaw on the run, no time to shoot you twice” piece or Leia’s holdout) even to chest plate
result in a mission kill (though not confirmed fatality).
> and kinetic stuff
Shrapnel from blasters hitting anything solid seems the most common type of “deadly projectiles” in SW, so yes.
Slugthrower projectiles presumably are comparable, though not omnipresent.
Add to that NBC and electronics. But all this adds weight. Which is why…
>perforated by arrows launched by teddy bears
Again, vulnerable spots. These suits don’t include overlapping solid protection on all sides. Wasn’t one stormtrooper dropped by blaster shrapnel to the rear of neck joint (when Leia hit a wall behind him)? So the plate (white parts) may well resist anything short of high-powered blasters or sledgehammer grade impacts to the head. The joints (black parts) are much weaker.