Not always the most useful

Great reminder by Derek Sivers in Useful Not True: most of the time, you don't need the perfect tool or explanation. You just need what's good enough to get you where you need to go:

Newton’s laws of motion from the 1600s work for most situations. They were good enough to get us to the moon. Then, Albert Einstein developed the theory of relativity, which showed that Newton’s laws are no longer sufficient. Then, quantum mechanics revealed limitations in Einstein’s theory. But yet, to launch a satellite into Earth’s orbit, we still use Newton’s laws since they’re simple and good enough for that purpose. The most accurate theory is not always the most useful.