actually composer is not that hard when used in a framework. but the one thing that should be avoided for me just my opinion BTW is to have too many configurations done in composer for initial installations especially like downloading 3rd party libraries for composer just to install or update a framework(had this problem with yii2 wherein i needed to install extra lib for composer), it should be all in one install and can be configured in a the same way inside the configuration files after the initial installation with composer. Hopefully, if the CI will use composer, it will be optional.
