It is always possible of course, that most civilizations are not terribly concerned with power, control, possession, expansion ... that they might have complete

It is always possible of course, that most civilizations are not terribly concerned with power, control, possession, expansion ... that they might have completely overcome similar problems of physical existence, become extremely efficient and long-lived, found delightful ways and places to live quiet, harmonious and peaceable lives, and never yearned to amass something visible across the galaxy. Heck, it's even possible that such civilizations once existed on this planet.