Not sure i follow - surely it’s not going to reduce your total comp but if company valuation say doubles over 1 year they’ll just give you half of your previous grant. So don’t think I’d call this a carrot.
In my experience RSUs are granted in a dollar amount at whatever the price of the stock is at grant time. If the stock price rises over the year, your grant value will increase. What I meant by the “carrot” is the dangling of this vesting/payday over x amount of years/quarters with no real guarantee.