Sharing salary information would give rise to more social inequality, taboo and bias about type of role, company and growth prospects. It allows HR to negotiate

Sharing salary information would give rise to more social inequality, taboo and bias about type of role, company and growth prospects. It allows HR to negotiate with you on their terms rather than based on competence. If they want to make salary sharing info public for all employees, they should also make it voluntary and pay employees each month for this release of private info.