well, slower movement and longer animations (not to mention lower accuracy) takes the speed out of a shooter, making it a little more open to thinking next to reflexes and instincts. Longer reloads is a first step as people will need to ask themselves more (only a bit more than usual, I digress) when they're going to reload, where they'll find the cover to do so relatively safely and whether they can afford to cast away an half empty mag.