I have not used ereaders long enough or intensely enough to have seen screen abrasion by touch. There are, however, great differences between screens.
Mine have been all glass, but for example there is a difference between Pearl and Carta (Carta wins). There is a difference of pixel density (the bigger the better, and anything below 200 is not worth it).
My Pocketbooks seem to not have as dark black colours as other ereaders. This could be fixable by having contrast settings on the ereader, but Pocketbooks do not have it.
Touch pens (or whatever you call them, I mean a
thing like this) work on eink screens, somewhat. However, I only used one for short testing and I am not sure if they could hold off abrasion.