Yes, there is a quantum theory known as the decoherence theory that provides an explanation for why macroscopic objects do not typically exhibit quantum phenomena such as quantum tunneling in practice.
Decoherence theory suggests that when a quantum system interacts with its environment, it becomes entangled with a large number of environmental degrees of freedom. This entanglement causes the system's quantum coherence, which allows for phenomena like superposition and tunneling, to decay rapidly. As a result, the system behaves more classically and loses its quantum behavior on macroscopic scales.
According to the decoherence theory, the interactions between a macroscopic object and its environment are so numerous and strong that any quantum effects, including quantum tunneling, become negligible and effectively disappear. This leads to the emergence of classical behavior and the absence of quantum phenomena in our macroscopic everyday experiences.
While quantum tunneling itself is a fundamental aspect of quantum mechanics, its effects on macroscopic objects are typically negligible due to the rapid decay of quantum coherence caused by interactions with the environment. Therefore, from a practical perspective, macroscopic objects are not expected to undergo quantum tunneling in a noticeable or significant way.
It is important to note that the decoherence theory is an interpretation of quantum mechanics rather than a fundamental law. Other interpretations, such as the Many-Worlds interpretation or pilot-wave theories, may provide different perspectives on the behavior of macroscopic objects in the quantum realm. However, decoherence theory is widely accepted and provides a compelling explanation for the classical behavior of macroscopic objects and the absence of quantum phenomena on larger scales.