Would there be only one reality, harmony could easily be reached as there would be means to describe that one reality.
Individual belief systems lead to different evaluations of the situation.
Worldviews lead to different priorities.
Experience creates different reactions to an event.
They all are part of the kaleidoscope we use to describe what we call reality.
It’s a lens used to understand the present and shape the future.
To reach one reality we are bound to find ways to create a common future.