I don't use it either. I think most devs wont as composer takes care of autoloading. I don't mind dropping it. (Do zf3 modules still support it anyway?)
Coverage remained the same at 80.453% when pulling 2c878bc5a6ebecbf25150f78826e68180ab4f1a2 on refactor-composer-config into 15d50773be07d350b4e32614cfebf6a23049842c on develop.
now uses PSR-4 and added test and check commands