According to book Life Ascending: The Ten Great Inventions o Evolution. (Lane, N.;2010),
Motility has indeed transformed life on earth in ways that are not immediately apparent, from the complexity of ecosystems.
As I understand it, when animals had begun to actively use their bodies to locate resources and thus left the sedentary way of life the amount of information they received has increased exponentially. It induced the rapid evolution of additional physiological, morphological and behavioural adaptations such as specialized brain regions enabling spatial memory, vision or cognition.
Was sociality also additional adaption induced by motility? Is sociality as a life strategy present only in mobile animal species, or they exist also a social sedentary organisms?
Working definition of sociality: Forming of animal group where information transfer enable cooperation among individuals.