I have made files comparisons of shots taken with my P40+ at 200 - 400 - 800 iso in 40mp and 10mp mode.
The lower res files have been upscaled in order to get identical files sizes (downsizing the high res files could also have been done but sounds not logical to me).
At the end, the 40mp files always win (better details/noise ratio than the 10mp files).
So the only remaining advantage of the bining function is to bring iso 1600 sensitivity that is not available at 40mp.
(ok, reduced file sizes on the mem card may also be interesting for some).
What are your thoughts about that, am I missing something ?