We may have made things that we don't need to survive, but we made things that make survival easier and chances of survival much more likely. We don't want to make things that get things done faster just because we're lazy, it's because we want to have more time for construction and production. Once more things are constructed and produced, once again survival chances are increased. Isn't the survival of yourself and the expansion of your species, after all, the subconscious if not conscious goal of all creatures?