Two torque stabilizing solutions in one watch. Does it make sense? I am not sure.
The fusee helps increase power reserve because you can utilize the initial supply. Like managing the surge in wind power. With modern springs nothing much going on in the middle. And when energy is low the remontoire gives up. As Journe calibers clearly demonstrates. Or indicated by the low power reserve of many other remontoire watches.
But regardless, you are absolutely right that it is a missed opportunity.