I’m not going to strongly defend it but this “doubling my production could only be equivalent to adding one more 1-in-1.5-millionth to the company's value, right?” isn’t true; if your work scales or you are managing people, you could move the needle more - say you launch a new service from scratch.
You could just work smarter instead of more and have a much larger effect on stock price.
You need to multiple it by the probability of that new service actually succeeding, which is low.
And even then, do you expect it to move stock price by more than 10%? Otherwise it's not going to meaningfully impact your RSU compensation