Why would you join taking compensation not knowing it’s value? In my experience companies will always tell you some mix of shares outstanding, current fair mark

Why would you join taking compensation not knowing it’s value? In my experience companies will always tell you some mix of shares outstanding, current fair market value and sometimes even the valuation for the next venture stage (I don’t see why as an employee you need to see the cap table). While predicting the future is impossible, this information helps to assign a non-zero value to the options.