While my own decision theory has no need of precommitment, it's interesting to consider that genes have no trouble with precommitments; they just make us want to do it that way. The urge to revenge, for example, can be considered as the genes making a sort of believable and true precommitment; you don't reconsider afterward, once you get the benefits, because - thanks to the genes - it's what you want. The genes don't have quite the same calculus as an inconsistent classical decision theorist who knows beforehand that they want to precommit early but will want to reconsider later.