>You really think these limitations are so overwhelming that practically no civilization could expand exponentially?
Yes, including the set of all civilizations that chose not to continue to expand exponentially as well as those that tried and eventually failed, due to any number of factors.
I think interstellar expansion (to say nothing of infinite exponential expansion) turns out to be just that hard and, for the relatively few civilizations that may actually advance to the point of even being capable of considering the effort, not worth the effort.
Yes, including the set of all civilizations that chose not to continue to expand exponentially as well as those that tried and eventually failed, due to any number of factors.
I think interstellar expansion (to say nothing of infinite exponential expansion) turns out to be just that hard and, for the relatively few civilizations that may actually advance to the point of even being capable of considering the effort, not worth the effort.