Well, what they can possibly do to counter these advantageous abilities is to restrict them. Not sure if Wide-Scan would really be needed in this game due to the mini-map, but if by any chance it is, then it could be restricted.

I was also thinking that mobs can be tailored to which class you enter as. Adding Magic Resistant Mobs wouldn't be really fair, unless they added fair amounts of each type so that there is some strategy involved in which mobs you fight.