I love the stage when you're so familiar with a library that you can find the root cause for every bug you hit (in an acceptable time).
miniblog.
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Selling electronic goods with instructions used to be the norm. It's much rarer now.
What changed? Did consumers stop reading them? Did the average consumer ever read them? Why is it acceptable to skip a manual now?
I'm still periodically surprised by how flexible Emacs is with symbol naming. Today's surprise: @ is acceptable!
Great introduction to omniscient debugging, including comments on keeping performance acceptable: https://www.drdobbs.com/tools/omniscient-debugging/184406101