'The whole point of joining is to allow the symbiont to accumulate experiences over the span of many life times. But in order to move on from host to host, the symbiont has to let go of the past...let go of parents, children, siblings, even spouses.'
I thought about that conversation when Ezri Dax pretty much picked up Jadzia's life exactly where she left off, and no one batted an eye about it.