Upvote:2
(1) can emptiness be unsuitable for some dispositions?
Yes. Genuine emptiness is the death of the self-instinct, which most minds cannot do. This is why some people have psychosis at meditation retreats or when taking hallucinogens, such as LSD. The self-instinct accords with ordinary nature. Where as emptiness is contrary to 'the world'.
(2) can emptiness be partially achieved?
For an unsuitable disposition, I doubt it. This is probably why many Buddhists give lip-service to emptiness but cling for their lives to reincarnation. But for those with disposition, yes, probably there can be partial emptiness achieved.
In short, the Buddha did not generally teach the Four Noble Truths, let alone Emptiness, to most lay people. DN 31 states a monk should teach a layperson morality & the path to heaven.
Upvote:3
There is a difference between conceptual understanding of Emptiness, and experiential realization of Emptiness. The first is at best a simile, a model, leading to the second. In worst case the first can even be an obstacle to the second.
Because of its nature, experiential realization of Emptiness may have demotivating effect. It certainly also has liberating effect, but there is demotivating effect as well. Which is pretty expected, considering that it cuts off the root of desire.
So, if the person has not developed strong Sila (ethics, altruism, compassion) and strong Samadhi (here, mental discipline, control over one's mental/emotional state) premature realization of Emptiness may make person either somewhat unhinged or else rather meek, depending on disposition.