The current understanding of the universe suggests that there is a significant asymmetry between matter and antimatter. This is known as the baryon asymmetry problem. According to the standard model of particle physics, matter and antimatter should have been created in equal amounts during the early stages of the universe.
However, observations and experiments indicate that our observable universe is primarily composed of matter, with very little antimatter. The exact reason for this imbalance is still a topic of active research in physics. Several theories and mechanisms have been proposed to explain this asymmetry, including the violation of certain fundamental symmetries, such as charge-parity (CP) symmetry, which relates particles to their corresponding antiparticles.
It is worth noting that while there may be regions in the universe where antimatter is present, they are not as prevalent or easily observable as regions dominated by matter. Detecting and studying antimatter poses significant challenges due to its scarcity and the difficulty in isolating it from ordinary matter.
In summary, the nearly equal amounts of matter and antimatter are not considered a coincidence, but rather a fundamental question that remains unanswered in our current understanding of physics.