Why aren't the lawyers in The Strong of the Law called Da Zhuang?

Hong Kong follows the British common law system. Lawyers are divided into two parts. One is a barrister, that is, a litigator, and the other is a solicitor. Only barristers can be called "generous", but solicitors cannot be called generous. Most of the lawyers in The Strong Man of Law, including Zhang Qiang and KC, are solicitors. Junior lawyers mainly engage in civil and commercial non-litigation legal services, defend in lower courts such as local courts and public security courts, and negotiate and accept cases on behalf of senior lawyers. In addition, when a party hires a barrister, it needs to be recommended by a solicitor and cannot be hired directly.