Why does the country not allow the production of completely soundproof earmuffs?

The country does not allow the production of completely soundproof earmuffs, because completely soundproof earmuffs may pose risks to people's safety and health. For example, when people walk in public places or streets wearing completely soundproof earmuffs, they may ignore the sound of the environment and be prone to accidents. In addition, wearing completely soundproof earmuffs for a long time may have a negative impact on hearing and even cause psychological problems. Therefore, the state may regulate the completely sound-proof earmuffs, and stipulate their scope of application and standards to ensure people's safety and health.