I actually don't believe in the deprivation account; I merely said that we disvalue death because it can cut short potentially good experiences. Personally, I don't think that it has any positive/negative value (aside from the process). I did not ignore anything you had said, but I apologise if I did so accidentally.
Whether or not we have a "reason" (in the sense of something being preferable for us) to avoid death depends on the framework one has. If they believe that nonexistence isn't valuable/disvaluable, they don't necessarily have a reason to fear death itself, but they could still prefer to avoid unnecessary harm as well as appreciate the good that life has (and also be a source of joy for others). If one believes in the deprivation account, then they would have to see if the harms in their life would outweigh the good. If the answer is yes, then perhaps they would indeed have a reason to prefer nonexistence over a valueless one. But, by the same token, an ultimately positive existence, even one that's "so-so" in many ways, could give one more reason to prefer existence over the void. Here, it would be important to distinguish between desires (which are ephemeral and dynamic-there are many people who switch between wanting to exist and wanting to not do so) and a "reason" for doing something (which would be the "right" thing to do that would be in our interest and lead to greater fulfillment, even if we currently don't feel like that). Unless one cannot find any sufficient source of value in their life, I don't think that dying/death can be preferable. But while death isn't desirable, the goods of life can certainly be, and I don't think that the mere existence of cessation implies that the positives aren't deeply potent. I already gave reason for taking the good into account:
1. The badness of dying (which isn't the exact same as being dead) is about experience. It could involve pain and also discomfort resulting from fear. Fortunately, it is still a small part of most people's lives (which numerous people find to be immensely meaningful) and it also doesn't seem to affect people to a degree that they cannot enjoy the goods. I would say that this is the right perspective because the fear is mostly counter-productive.
2. The badness of death itself might only be about the loss of potential life. But nobody prefers life in isolation without considering the positives/negatives. In view of this, it could be said that an inability to live long is bad due to the absence of goods that could have existed. But the alternative to perfect goodness is some good, not nothingness
;)
And the prevention of a "loss" cannot be "good" if there's no gain in the first place.
We could still have reasons to delay it if a certain kind of life is necessary for heaven. But aside from that, we do have a desire to avoid death. It might have a lot to do with an instinct to propagate and to avoid terrible pain, but it's also about a need to prevent a perceived loss of future good. Some would, however, argue that this fear isn't necessary because nothingnes cannot benefit/harm a person (unless there's some specific form of heaven/hell)
Having a desire to cherish goods and avoid harm doesn't have much to do with hell. The reality is that "so-so" lives might also have small satisfactions that matter more to a person than a potentially painful death. There's also a lot of fear associated with it from our environment and culture.
Once again, I don't think that non-existence would have any value. But as as as the deprivation account is concerned, I think that a "so-so" life which is still good (overall) would be better than nonexistence. But if someone truly has a negative life and wish for it to end, then a momentary need to avoid death migh not be too important to consider, since they could rationally see that their potential future existence would mostly be bad, which would be prevented by their death. Death might still be a smaller harm if they continue to have a desire to avoid it, but it could also (and I hope that people don't have to be in such a situation) be good for them if it proves to be a source of relief for someone in pain (and the relief outweighs the negative feeling generated by the aversion). I don't think that death "alters" anything. It does cause pain, but this doesn't mean that the good experiences a person has had throughout their life don't matter. It could lead to fear, but I think that it can be mitigated by accepting its reality and cherishing the precious goods while they do exist. Nonexistent beings cannot be in an altered state of affairs, and I don't think we can be sure that the void isn't some terrible state that can only be relieved by existence either.
I also think that you've made some hasty generalisations that aren't justifiable. "So-so" lives is a vague term that matters differently for different people. I've met many people with such lives who don't feel that they have a strong need to avoid death (aside from fear of pain or cultural/societal influence). And of course, there are others who don't have the best lives, but still cherish existence in general over nonexistence. This comes down to personal values of the individual, not some nonexistent "altered" state that death supposedly brings us in. And, as I have already mentioned multiple times, I don't think that the moment of death has to negate all the positive experiences a person has in their life. Sometimes, the true reason for seeking to avoid the door is not (just) the door itself, but the majestic room just behind us. Whether or not we want to acknowledge that and recognise the diversity of the sentient experience is a different matter.
Once again, I am not saying that the deprivation account is necessarily true. All I am suggesting is that there are many biological/philosophical factors involved regarding death, and it isn't clear that its mere existence negates the strength of a good aspects of life.
In light of this, I don't think that the existence of death is an argument in favour of antinatalism. Thanks for this post, and I hope you have a wonderful day!