These dishes are ceramic with a hardened, baked on glaze. The glaze is, by your standards, I think, akin to glass. They will scratch and wear with everyday use, though not terribly. If you are worried about wear, a wash cloth or piece of fabric between each piece will keep them from harming each other.
If it is nagging you, Leppie, do what your nagging mind says to do in order to snuff the voice. If separating each dish with a protective piece of cloth keeps the voice at bay, then it certainly won't hurt, and your dishes may very well last years longer.
I hope they bring you joy for years to come.
Don't know the durability yet, but for everyday dishes, I'm not going to do anything special for them.