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Also, you'd need to know for certain that the planet you're sending your generation ship to is habitable for your species. While this may be technologically trivial for a society that can build a functional generation ship, the timescales for such projects (literally hundreds or even thousands of years from the launch of the probe to the yes/no signal) makes it extremely difficult to actually organise.
Lol we get to the planet and find it was obliterated by a gamma ray burst 50 years ago
That and you won’t even know if the destination civilization is still there by the time you arrive.
Or just send a lot of ships and hope one or two find something good.