Perhaps the communication process varies a bit then. The only situations I've ever encountered or heard of come in the form of "X units". E.g., After starting you might be assigned 1000 RSUs that vest in two years. At the two year point when you receive them you're given the $ value and often (not always) the company will automatically withhold the portion necessary to cover the taxes that will come due that year.

I've never heard of RSU grants that might vary with market price where the person did not know 1) That any $ amount quoted was based on the current market price of the stock; 2) The actual # of RSUs being granted; 3) That when they vested their value would be dependent on the stock value at that time.

I know sometimes grants are made in the fashion of "10% of your base salary". But whenever the grant value might vary with market price I'd be very surprised if the actual # of RSU's was not information available to the employees. Even if the company dropped the ball in a compensation notice & didn't explicitly state the # of RSU's, that is still information that would almost definitely be included within the employee's compensation section in the company's HR portal.