I wouldn't deny that enlightened Eastern sages have those experiences of joy, awe, and so on. The question of nihilism, though, is whether those experiences follow from these philosophies' theoretical contents. I'm saying the content implies nihilism. Whether the sages end up having happier experiences could be due to something not covered by the essence of Buddhism or Daoism.

The spiritual discipline is meant to terminate egoism, so you'd no longer be preoccupied with small-minded plans that are bound to disappoint. That's fine and understandable, but whether the sage ought to end up being content with all events is another matter.

A nihilist could be content, too, in merely impersonally observing the necessity of whatever happens (including wars, rapes, etc). Likewise, a nihilist could end up crying so much that the crying turns into laughter. That's a psychological question of how the human brain deals with trauma, including the trauma of enlightenment.