My list of pet peeves would include: Material Components, Darkvision (except at the lowest levels, and even then, it's far too complex), Encumberance (it's just not worth taking the time to calculate), 3rd Edition Spellbooks (if you're going to let them pick spells, why go through all of this), Psionics (from previous editions), Evard's Black Tentacles (how many dice must be rolled to resolve this spell???), Rations (keeping track of "enough food"), and Alignment.
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