The FHI paper, Eternity in Six Hours, asserts that traveling between galaxies and colonizing them is a relatively simple task for a star-spanning civilization. The paper even asserts that humanity itself could accomplish this in the foreseeable future. Because of this, the paper says the Fermi Paradox is even "sharper" than it was already. (This paper was published five years before another FHI, Dissolving the Fermi Paradox, which shares one of the same authors.)
Yet even if we consider the Fermi Paradox resolved, it's still valuable to know what's possible to accomplish with regards to space colonization. Arguments for the astronomical value of the far future assume space colonization is possible, hence we want to evaluate arguments for why this is true.