Some of those saddle looks downright dangerous. I use the nose of the seat to help me steer the bike or hold the line at high speed. I also think having a nose on a saddle helps keep the bike from shimmying. Or if it starts to shimmy, having a nose on your saddle goes a long way to kill the shimmy.

Simply, having a nose on a saddle makes my bike feel more stable.

Now I.S.M's adamo saddle is bit different. Adamo TT shortened the nose so that you can move the seat further forward than a regular saddle and still be in compliance for UCI sanctioned TTs. There is a rule about the horizontal distance between the tip of the nose to the center of BB.