Yes, and a reason for it subtitle "A Handbook of Black Magic" :). In the olden days EEs would more or less guess by intuition and heavy sprinkling or randomly placed pullups/pulldowns/capacitors to force designs into stable working order.
Dont remember the exact video, but Bill Herd mentioned many times about on site last minute fab fixes involving prodding the product on a hunch of where the problem might be.
Today you can simulate and measure pretty much everything, plus automated design rule tools will warn you of potential problems beforehand.
https://hackaday.com/2019/01/24/video-putting-high-speed-pcb...
Dont remember the exact video, but Bill Herd mentioned many times about on site last minute fab fixes involving prodding the product on a hunch of where the problem might be.
Today you can simulate and measure pretty much everything, plus automated design rule tools will warn you of potential problems beforehand.