It seems like there is an implicit assumption in both article and comments that interstellar travel necessarily involve living things. If a civilization is will

It seems like there is an implicit assumption in both article and comments that interstellar travel necessarily involve living things. If a civilization is willing to put possibly millions of years into waiting and preparing for a wandering planetoid, why not launch robotic ships with the equivalent of frozen embrios onboard? The timescales involved are pesumably much longer than the life of an individual anyway, so the end result should be no different.