@jerryg123 - do you have any experience with upgrading an audio component?
Why - simple, to achieve a better sounding system.
All mass produced products are built to a price point. For example - when was the last time you looked at a point-to-point wired product. Seen Audio Note Capacitors or Resistors in a product. Custom wound transformers? AC filter chokes, etc. V-Capacitors? Hardly ever!.
So by modifying a component with these types of parts upgrades you get to a level of sound quality you almost can never achieve with a mass produced audio product especially within the price points most people here have heard or purchased. In fact, you can get to a reference level that most people have never heard before and most likely, never will with a mass produced product.
So I hope I have answered your question.
Happy Listening.