Thank you for pointing this out! I come from biology, and yes, you almost never get your model to fit the data as well as a physicist would with his - because there are just way too many factors involved! (In fact I would probably treat too high a correlation in a publication as suspicious.) When you're working with living organisms, their sheer complexity and diversity is going to limit the statistical significance of your results (which might be why the urge to p-hack can be so strong). This doesn't mean we're doing bad science; on the contrary, I would argue that we are simply doing harder science...
