This seems to simply wrap each item in a cardboard shell, is that protective? Also whenever someone complains about receiving a tiny item in a large box, the an

This seems to simply wrap each item in a cardboard shell, is that protective? Also whenever someone complains about receiving a tiny item in a large box, the answer is usually that Amazon does so to optimize the filling of its trucks so that all the boxes are densly packed (no room for them to fall), wouldn't having each item its own custom sized box hinder that optimization?