Conventionality has greater meaning for those who follow them without raising any questions about it. Convention is largely related to religion which is something connected with the belief and emotions. Therefore, no body dares to raise questions about conventionality. But those who are against are branded as reformists.
Bertrand Russell said, “Conventional people are roused to fury by departures from convention, largely because they regard such departures as a criticism of themselves”. But if you imagine a situation wherein you throw away all the convention to the air and live as you like, there would be no morality nor there would be a code of conduct for every human to live with. So, conventionality is essential but it should be within its limits such that they do not interfere with the basic reasoning that is unique to humans. Here are various views on conventionality; read them and enjoy.