It's just that all our dreams are personalized and people tend to agree on things that they bear witness to the occurrence. Nobody can witness a dream except the individual who dreams the dream.
Interestingly, dreams are unique in that even the most extraverted people sleep alone. During sleep, every person is isolated into his/her own world.
And clearly dreams do have application to daily life.
For example, I had a dream that there was a magic golf cart that could skim across the USA from Seattle to Boston by SKIPPING across the boring spots.
This dream INSPIRED me to get on a Greyhound Bus one weekend, sleep on it, and wake up during different days and stop and tour whatever city I felt like on the way. By sleeping on the Greyhound Bus (not a hotel)....I had 24/7 travel...enabling me to go from the Atlantic to the Pacific in the span of a weekend.
I did this in college using buy-back book money....it was the best thing I ever did at that time in my life.....alllll because of a dream....so don't say dreams have minimal application