Keep in mind that Keyboard Maestro has been in Peter's hands since 2004 and has been commercially available since then – so we now have 20+ years of development behind the product.
Keyboard Maestro was created and first released in 2002 by Michael Kamprath and purchased by Stairways Software in 2004, and has been in continuous development since then.
I started using Keyboard Maestro version 1 in 2004 alongside QuicKeys, which I was pretty certain was nearing end-of-life.
It's grown and grown since then...