Is daydreaming a good or bad thing?

The word "yi yin" originates from the novel 'Dream of the Red Chamber.' People are not unfamiliar with this term, yet it is rarely mentioned in public or used in writing. Its meaning refers to a kind of spiritual寄托. Regarding "yi yin," there are different perspectives depending on one's standpoint. Some people believe that even though "yi yin" is a mental act without physical action, it is still immoral and long-term "yi yin" may lead to psychological disorders. However, some psychologists think that people who engage in "yi yin" are healthy, creative, proactive in sexual activities, and enjoy a happy sex life.