I think when a sub says "you can do whatever you want to me" what they're actually wanting is to not make decisions anymore, and they think by saying this they can foist the decision making off on the dom without having to do any of the work beforehand. But unfortunately to get to the Not Making Choices part of kink you do in fact have to make a Lot Of Choices beforehand and communicate those choices to your partner. This is an essential part of the process and skipping it is both unsafe and unfair for whoever you're playing with.
Not Making Choices is the reward for communicating clearly, not the default
