Why is it an advantage to not have voluntary control over some muscles?

Not having voluntary control over certain muscles, such as those in the heart or digestive system, allows for automatic regulation of vital bodily functions without conscious effort. This autonomic control is crucial for maintaining homeostasis, as it enables the body to respond swiftly to changes in internal and external environments. It also frees up mental resources, allowing individuals to focus on other tasks while essential processes continue to function smoothly.