Is the advice "don't operate light switches barefoot" outdated?
I don't think the advice was particularly salient in the 80's or even decades before. I think it was based on some irrational fear &amp;/or misconception.
Don't use light switches with wet hands - which is why bathrooms have pull-switches. That makes sense, but to extrapolate that to any &amp; all light switches for fear they're badly wired, unearthed &amp; the shoes will stop you becoming the route to earth… sorry, that's irrational fear.
It belongs in the same category as always making sure socket switches are off if nothing is plugged in, which still sees some adherents even in the UK, where you'd need a slim screwdriver to even open the socket gates be able to poke something into one.