If a rider needs a shorter top tube, then it will give it to them. There are lots of bikes out there with the rider's hands behind the steerer, they don't seem to be crashing because of it. Stem length doesn't play in handling, regardless of what people's intuition and the industry's marketing puffery tells them. Except the industry has recently gone through a phase of pushing zero length stems.

The rider triangle is a good way to think about fit, but if you rotate the triangle forward, the rider still has to hold their head and torso up. So depending why it's done, it may not increase comfort at all.