The usefulness of an LLM is similar to the usefulness of a baby, but higher.
The term stochastic parrot has nothing to do with usefulness and everything to do with the existential meaning of whether this ai is repeating what it is taught or creatively forming new knowledge from logic and composition from previous knowledge.
It is categorically unequivocal that LLMs do not just parrot previous knowledge stochastically. They form new ideas from scratch.