I. All adults are presumed to be capable of managing their affairs and to have legal capacity. II. The manner in which an adult communicates with others is not grounds for a determination that the adult is incapable of managing the adult's affairs. III. Execution of a supported decision-making agreement may not be used as evidence of incapacity in any proceeding. IV. The execution of a supported decision-making agreement does not preclude the adult who has entered into such an agreement from acting independently of the agreement.