i think ur the one confusing production with engineering..
almost always production = beat the producer will alter the beat after vocals are layed but after that the producer hands the track to the engineer to mix and master
a production is more than just the beat dog lol...you're confusing beat-writing with production. a producer covers the whole project, not just the back-track. your thinking mixtapes, not albums right now. Just Blaze is in the studio with the people he produces for, and follows the song until the final fader sequence. believe that. you can have great production, but bad beats.