Quantum mechanics does involve inherent randomness at the microscopic level, as described by probabilities and uncertainty principles. However, it is important to clarify that quantum mechanics does not imply that "everything" in the universe is random. Rather, it provides a probabilistic framework to describe the behavior of particles and their interactions.
Quantum mechanics is considered the most accurate and successful theory in physics because it provides highly precise predictions and explanations for a wide range of phenomena. It has been extensively tested and verified through numerous experiments and observations.
While randomness is inherent in quantum mechanics, it is not the sole defining aspect of the theory. Quantum mechanics incorporates a set of mathematical principles and equations that govern the behavior of particles and their interactions. These principles, such as superposition, wave-particle duality, and the probabilistic nature of measurements, allow us to accurately predict and understand a vast array of phenomena.
Quantum mechanics provides a consistent framework for understanding the behavior of particles, atoms, molecules, and their interactions. It successfully explains phenomena such as the behavior of electrons in atoms, the properties of materials, the behavior of particles in accelerators, and the workings of electronic devices.
Additionally, while individual events may be random or unpredictable at the quantum level, the statistical behavior of large ensembles of particles governed by quantum mechanics becomes highly predictable and deterministic. Quantum mechanics provides a statistical description of the behavior of many particles, which allows for precise predictions at the macroscopic scale.
So, while quantum mechanics incorporates randomness at the microscopic level, it also provides a highly accurate and successful description of the physical world, making it an indispensable tool in understanding and predicting a wide range of phenomena in the universe.