Why is it better to use classes in AS3

Question

I do not like external files. Most developers prefer this and claim it is better. Explain why it's best to use classes in ActionScript 3.0.

My ActionScripts are different. I remove the classes and paste them into the Flash IDE. 9 out of 10 times works great. My question is Socrates, but I really feel ignorant about this because there is less code for what I'm trying to do. Enjoy it.

Here's a tutorial that I reviewed - “Keyboard Output Testing Example”

//AFTER
//remove curly brackets and "outer shell of class definitions"
//remove class function "don't need it"
//function at bottom, remove "public", make sure it has a body {}
var _time_scale:Number = .25; 
var _frames_elapsed:int = 0; 
var _clip:MovieClip; 

function handleEnterFrame(e:Event):void { 
_frames_elapsed++; 
_clip.gotoAndStop(Math.round(_clip.totalFrames * _frames_elapsed * _time_scale)); 
}

//BEFORE
package { 
    import flash.display.MovieClip; 
    import flash.display.Sprite; 
    import flash.events.Event; 

    public class Main extends Sprite { 

        private var _time_scale:Number = .25; 
        private var _frames_elapsed:int = 0; 
        private var _clip:MovieClip; 

        public function Main():void { 
            _clip = new SomeClip; 
            addEventListener(Event.ENTER_FRAME, handleEnterFrame); 
        } 

        private function handleEnterFrame(e:Event):void { 
            _frames_elapsed++; 
            // we multiply the "real" time with our timescale to get the scaled time 
            // we also need to make sure we give an integer as a parameter, so we use Math.round() to round the value off 
            _clip.gotoAndStop(Math.round(_clip.totalFrames * _frames_elapsed * _time_scale)); 
        } 

    } 
}

There can be no answer, but there must be a definite explanation that makes sense.

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