My teachable moment was about 25 years ago. The pcb agreed perfectly with the schematic but the pcb designer worked without engineering guidance. The switching buck regulator did not work AT ALL. No output. Nothing. Zip. Nada.
And I do not really understand what is the “Discourse” program, but I like the way this forum works MUCH better than the others I can think of, such as EEVBlog or Electrotech.