RE: 1.d4 Opening Repertoire Mnemonic Memory System Challenge part 2: QGD and QGA

Sorry, had no time to go through all, but what´s the point of remembering all those variations, if you are not considering the evaluations, the pros/cons or the reason of why preferring one over another variant. I often saw some of those in real games and was not aware that they have even names.
Or is it just a memory exercise?