“There is no single development, in either technology or management technique, which by itself promises even one order of magnitude improvement in productivity, in reliability, in simplicity.”
Fred Brooks, No Silver Bullet (1986) · Abstract · read it
Kept because it has been tested against forty years of silver bullets and holds. Each new tool, including the current one, is sold as the exception. The base rate says to expect a good gain and not a tenfold one.