Agents who understand and explicitly use a decision theory along the lines of TDT/FDT may be said to be implementing an interface, which consequently modifies the expected outcomes of their decision process. This is important in situations like deciding how to vote, or even whether you should do so, as you can estimate that most agents in the problem-space will not be implementing that particular interface, so your doing so will only entangle with the outcome of the limited set of agents who do implement it.
To extend the programming metaphor a bit:
Agents who understand and explicitly use a decision theory along the lines of TDT/FDT may be said to be implementing an interface, which consequently modifies the expected outcomes of their decision process. This is important in situations like deciding how to vote, or even whether you should do so, as you can estimate that most agents in the problem-space will not be implementing that particular interface, so your doing so will only entangle with the outcome of the limited set of agents who do implement it.