When I wanted to customize the Nivo Slider add-on in 5.4.x, I used to edit the following files:

1. packages/nivo_slider/blocks/nivo_slider/css/default.css
2. packages/nivo_slider/blocks/nivo_slider/css/nivo-slider.css
3. packages/nivo_slider/blocks/nivo_slider/js/jquery.nivo.slider.js

>>> That was enough.

In 5.5.1, however, the Nivo Slider code is included in the core files, already:

1. concrete/css/ccm.app.css
2. concrete/js/ccm.app.js

>>> Now, I have to edit/override these files, too.

This doesn't make sense to me. I'm just wondering why an add-on code is included in the core files. Isn't this unnecessary?

Can anybody explain this to me?