All it needs to be is useful. Reading constant comments about LLMs can't be general intelligence or lack reasoning etc, to me seems like people witnessing the airplane and complaining that it isn't "real flying" because it isn't a bird flapping its wings (a large portion of the population held that point of view back then).
It doesn't need to be general intelligence for the rapid advancement of LLM capabilities to be the most societal shifting development in the past decades.