I have long been of the opinion that goalkeepers should dispense with walls and trust themselves if a fellow has a shot from twenty five yards out and they are seeing the ball all the way.
The wall obscures your view plus there is a greater danger of the ball deflecting past you into the net than the bloke actually scoring directly from it.
....you'll remember that during Southall's time defenders were encouraged not to close shooters down as the only way he would be beaten from distance is via a deflection.
I understand what you are saying but the balls do move about a lot these days.