At the time of the Sundering,. What was the level of technology on the planet? More advanced than we are.more advanced than 22d-24th century SF?
Lest not exclude sleeper ships.I am not convinced the exile ships had FTL drives. Between the wars, and the long lifespan, warp drive might not have been discovered or a priority for intrasystem travel.
Might be Vulcan was a stagnated interstellar empire for at least a thousand years, having warp and rayguns but making little progress because of the constant infighting. Lost colonies would be the norm - but most of them would be lost for real, rather than merely cutting communications like the Romulans did when the homeworld policies grew distasteful.
Both planets Vulcan and Romulus could have been originally seeded from the same gene pool by Sargon's old empire. Both evolve into equally violent races (after all, it's in the genes though one race develops or genetically engineers head ridges within one hundred years after TOS to make their race visually distinctive from the other), but about one or two thousand years ago, Vulcan pursues the logic philosophy (and not much in the form of a government)Which probably is the more interesting great migration, possibly but not necessarily related to Sargon's old empire.
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