Why not make plugin have Bindable mixin?

I noticed that all plugins do not have Bindiable Mixin. Why not?

Code:

        plugins: {
            xclass: 'Ext.ux.BoxReorderer',
            listeners: {
                drop: function() {
                           // imagine 20 lines of logic
                }
            }
        }

If I'm using pure MVVM then I really should implement drop in the controller. Perhaps there is a reason why this was purposefully not allowed. Can anyone englighten me?



Why not make plugin have Bindable mixin?