Sometimes you just have to make room for the future. A little spring cleaning so to speak, when old memories may prevent you from growing, maturing, and progressing. I'm not saying this in a cold way, if we erased our memories, what would we learn? I'm just saying that the buildings they occupy in our mind can crowd the skyline a little too much if we spend our time attempting to relive the past, and then you tend to run low on real estate for the present/future.
I think basically everything Andy has said, both in writing and visually, can be said of today's music and my philosophy in general. Progress and evolution must always continue forward, and we must therefore be constantly re-evaluating that which we wish to assimilate versus that which we should discard. No principle or belief should be above this review process.