The fact is that the disc is continually loading and unloading to some degree and therefore accelerating and decelerating constanly.
Because it takes more time for heavier blades to spin up, if you lose rpm, (and we can't afford that), you have to use more power to control them. Frank and all engineers know that that's why they apparently haven't increased the weight of the new ones.
Harder to lose rpm but much harder, (power), to get it back.
It's not an ideal world, unfortunately.
