A while ago I saw a great lecture/presentation by Dino Dini (creator of Kick Off etc) and he made a comment about the importance of air resistance. Didn't quite understand what he was getting at. I do now!
The ball is being kicked with the same force in both videos. Without simulating air resistance, you can't get a realistic long/high goalkeeper kick without the ball flying off the pitch (or bouncing once and then flying off too quickly for players to react).
So, according to Dino, games that didn't simulate air resistance had to hard code a fake vertical bounce to keep the ball in play. Interesting stuff (for a nerd).