if you are grinding 1 dungeon people will see you coming out then going back in a lot. if your using dungeon finder i think that is safer. questing from 1-90 afk is always a risk. youll get reported or stuck. i think when you focus on 1 thing only it stands out more. i like to mix it up do questing for 10 levels then go back to grinding dungeons for 10-20 levels. best bet is to mix up what your doing .