Would prevent such exp amount on current high-end dungeons (Abyss, Nameless, Thor)
Would prevent appearing of BG equipment, Ulle's Cap and Satanic equipment
Would change current ways of avoiding skill cooldowns, to prevent pvp-gameplay with 10 skills in one second, which resulted in needed potion autohotkey eating, because without it you wouldn't live enough, which resulted in overall laziness about collecting enough potions before each WoE, which resulted in popularity of fast highrate WoE-servers where you don't need to do anything, just take consumptions and go war, which is cancer of all other good things at RO