"More soft shell" suggests something that is pliable or yielding to the touch. However, if we were to consider antonyms for this phrase, we might think of words such as rigid, hard, inflexible, tough, and firm. These words convey a sense of hardness, stiffness, and resistance that stands in direct contrast to the softness of a pliable shell. While a soft shell may be desirable in certain contexts, a harder shell might be advantageous for protection against external forces. Ultimately, the choice between a more soft or more rigid shell depends on the needs of the organism or object in question.