I understand the point you are trying to make, but actually the reason why modern hardware earns so much more points than hardware in the past did is not because the scoring system has changed, its actually because it has stayed the same.
Allow me to explain. The reason that it is easier to earn more points faster today is because points earned per work unit increase significantly the faster a work unit is finished. If a work unit is completed in one hour instead of two, significantly more than double the points are rewarded for doing it in half the time. The faster a researcher can get a work unit back, the quicker the data can be analyzed; this is why the point system has been set up this way, to incentivise running the fastest hardware as quickly and consistently as possible. Theoretically, the point system could have been set up so that the same amount of points are assigned per completed work unit regardless of how quickly it is finished or that there is a 1:1 progression ratio between time taken to complete a work unit and points rewarded, but instead it was set up to be significantly more rewarding the faster your CPU or GPU can complete a work unit. Thus, the reason powerful modern GPUs can earn the same amount of points in significantly less time than those who have done this for a long time (but on older hardware) is simply a product of the way points are rewarded and have been rewarded all along.