Three jobs matter. First, give marketing one place to define content pillars, themes and campaigns. Second, automatically generate post drafts in each employee's voice so the blank-page problem goes away. Third, surface analytics that connect posts to the business outcome you picked in your strategy.
Most legacy tools solve the third job and outsource the first two to the marketer's calendar and willpower. That is why programmes stall. Employees receive a login and a library of corporate posts to share. They share two, then stop. The tool reports low adoption. Marketing blames the employees.
The real failure point is earlier: the software did not remove the friction of writing. If the drafts do not feel like the employee's own voice, the employee will not post. Voice quality is a software problem, not a motivation problem.