Which theorist(s) regarded the child's self-directed speech to be important, sophisticated, purposive, or communicative?

Question

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Vygotsky believed that self-directed speech, also known as private speech or egocentric speech, is important for cognitive development and serves several purposes, such as regulating behavior and thought, problem-solving, and communication with oneself. Piaget, on the other hand, regarded it as immature egocentrism that gradually disappears as the child becomes more socialized and gains an understanding of others' perspectives.

Which Theorist(s) Regarded the Child's Self-Directed Speech to Be Important