Trouble with Impositions The beauty of bestowing a good that cannot be solicited without letting pessimistic biases affect one can be quite valuable. If an action can be "paternalistic" even though it isn't going against the interests of an existing being, then it can be genuinely kind due to the fact that it gives positives. It would be wrong to push someone because one thinks it is in their interest, since the likelihood of that being true is extremely small (there is a very small chance that they wanted to be pushed, but the possibility is so small that it wouldn't be reasonable to focus on it instead of what is more probable, i.e., the person not being in favour of the action. Similarly, the mere possibility of a negative outcome (and I still doubt that action that doesn't violate/fulfill one's desires can be good/bad/a gift/an imposition) doesn't mean that one should not try to act in a beneficent manner that would allow ineffably powerful positive experiences to exist. In reality, non-existence (probably) doesn't restrict one's freedom (which isn't why it's paternalistic), and creation does not take away one's freedom (which is why it isn't paternalistic either). If procreation can still be considered paternalistic by some, then it can also be seen as an act of beneficence by others. There is no asymmetry here.
Paternalism: "relating to or characterized by the restriction of the freedom and responsibilities of subordinates or dependants in their supposed interest." Thankfully, non-existent beings aren't in some free state of affairs that is being taken away by their creation. However, it could be possible that certain flawed worldviews would mislead innocent people (capable and willing of being good parents) not being able to have a family they would have cherished due to an enormous yet unnecessary moral burden. This isn't probable (for now), but it is nevertheless possible. Impositions, troubles, and paternalism are not the only—or even the primary —things that should matter. Gifts, opportunities, and kindness are also important. Despite everything, the positives will always remain relevant.