> It's like looking in the wrong place, because the light is better there. Yes, and actually one of the challenges physicists face, is that looking by the lamp

> It's like looking in the wrong place, because the light is better there. Yes, and actually one of the challenges physicists face, is that looking by the lamp is not self evidently reasonable for most people. Of course you start with the easy case and then you build on that foundation, otherwise your analysis just hangs in thin air. (Plus you have to deal with the easy case anyhow if you want to do comprehensive work, you can as well start were you have a chance.)