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To be clear, this supposed etymology is absolutely false. Wikipedia has an entire page about this myth: https://en.wikipedia.org/wiki/Rule_of_thumb

Sadly, it’s about feelings, not facts. That’s how indoctrination works.

So you're telling me you don't get offended at a phrase originating from an old story in a completely different context your friend told you that you didn't bother to fact check?

Opposable thumbs are what separate my species from others, therefore it's a huge part of my identity. If someone resists there phrase "rule of thumb", they're attacking me personally.

Check your privilege. Not everyone has opposable thumbs.

Used in a similar fashion in Boondock Saints.

Using this as a reputable secondary source in the OP document would not surprise me the least.

"Rule of thumb" has just joined blacklist and quantum supremacy.

If she yelled at you, please complain about her.

I think you just summarized most of this list and this movement (not all! but most).