A few years ago, I remembered a tutor who asked me these questions. And it takes me a while to come up with an answer. This is the answer that I could get. So I just type here randomly. Just a random thought only. Haha. :)

What would the world be like if everyone were exactly like you? In terms of Personality Traits.
- The world would finally be at peace. A plain, dull and peaceful place. The world would all get
along. Everyone are leading the same life.
- People become judgmental
- A world full of autistic people
- Nothing interesting to complain or gossip about. Humanity would eventually go extinct.
- Imagine how awful it is if everyone knows all the things that one thinks and does!?

What happens if everyone think the same?
- It would become unproductive. Innovations would come down as well as progress and development. Nobody will do a job of a road sweeper, peon. Many occupations will face hardship to survive e.g. entertainment industry. Haha.

Haha. The importance of diversity, so that we are able to learn from each other.

This reminds me of a quote saying "It takes all sorts to make a world."