To maintain clean records of both profit and loss margin reading as a trader is inevitable because despite the level of knowledge you might have acquired there must always be a newer technique you learn each time you seek to update your previous views about how the market behaves.
Changes and upgrades in mentality, knowledge & even life are necessary to keep up with the pace the world is moving. If someone is kept in isolation for 10 years and then asked to explore the world, he might feel lost given how rapidly things have changed. We are humans evolve quickly and the ones who learn things faster than others are always one step ahead of them.
As a trader it is important to utilize the new and improved tools and guides in the market. The same strategy cannot work lifetime because remember in trading, if you are earning, there is surely someone somewhere in the world who is losing and is working hard to beat you. By making subtle but constant changes you remain one step ahead of others and survive at this cutthroat pace we are going right now.