Every effect indicates its cause to some extent. The causes in this case would be the focus on the illusion (i.e. the ignorance of reality) and the focus on the reality. Reactions would indicate one state of mind or the other. So the question is which mental state indicates the best, most enlightened frame of mind.
You suggest that all emotions except for peace and acceptance are arbitrary. The effect of enlightenment is the lack of any emotional reaction, the letting-be of everything, given the recognition that it is what it is and can't be fundamentally changed.
The lack of emotional reaction would make sense as a reflection of the universe's mindlessness. That is, if an enlightened person were trying to reflect the essence of all reality within the human frame, he or she might naturally do so by exercising as few of her distinctly human capacities as possible. In that way, this person would internally resemble the oneness of the universe: mindlessness reflecting mindlessness.
However, although nature is mindless, nature isn't neutral in all respects. Thus, inner peace seems to be a copout, a failure to reflect the character of natural reality. This kind of enlightenment holds up one last filter or defense mechanism to block the more natural existential reaction. This defense is the lobotomization that enables a person to feel indifferent. You can mentally detach from your identity as a hapless creature in the natural whole, and abstract from the universe's real complexifications and evolutions.
We're back at the conflicting views of enlightenment: mystical monism versus existential cosmicism.