I've had a few descends lately with very strong tailwinds (>100 knots). Prior to descend, I entered the expected winds in the descend forecast page and those values later matched the actual winds quite well.
However, I observed the aircraft flew way faster than predicted to chase the path and then strayed above the path, requiring the speed brake to bleed of energy. It appeared to me, that the VNAV path calculation does not consider the wind from the descend forecast page. I heard, that the real VNAV is hit and miss as well, is this the intended behavior or is this an oversight of the simulation?