>>1897
>Is it possible for somebody to stop being undead?
By finishing your path up and then incarnating a new part of yourself to develop a second form. Your undead manifestation then remains on the astral but you go back down again.
>Are the disadvantages of being undead or would anyone even want to stop being undead?
I don't think there are any disadvantages compared to the alternative for humans.
>Not being able to reincarnate and worrying for your mental health already appear as limitations and drawbacks to me.
The limitations and drawbacks of being human is the "fate of annihilation". It means that someone who is a "good person" but doesn't move beyond being human, will keep reincarnating through history. At one point the society they live in will have degenerated. Because they are merely human, they will go along with this society and commit sins which make them unsalvageable. This will happen to all humans who remain human and have no intention of ascending. Even if they were a yogi in one lifetime, they may not finish their path up and die because of lack of time, then they will not find a new chance in the next life and the path to final destruction and hell will be resumed. Becoming undead will increase the time until you can make it, it means escaping this fate. Mental health issues forcing you to rebirth every 400 years is a small price compared. The lyran race and a few other successful ones are able to ascend as a group, because they created an extremely collectivized society where their minds are controlled by AI and their bodies are cybernetic. They have no personal possessions at all, they're completely integrated in the system. Humans have had no way of doing this, when they tried communism it became like in Russia and China. "Vampirism" and this chaotic Sunflower project seems like the only options.