[JadeNB]

> I tend to forget that people don't know stuff I learned decades ago and consider them as general knowledge.

While all of us who are lucky to be around long enough meet the problem of general knowledge changing under our feet, it's hard for me to imagine how saying this to someone can be a productive contribution to the conversation. What can it accomplish other than making someone feel worse for not knowing something that you consider general knowledge?

[whynotmaybe]

I don't think anyone should feel bad for not knowing something.

My "general" knowledge is built on my experience.

The first comment before OP answer's was kinda condescending about the article and I felt the same way when reading it but then op's comment made me realise I was in the wrong because I forgot that my "general" knowledge is not general at all.

OP had to defend why he posted it. I wanted to tell OP that it was a good idea to post it, not for the article content, but for my teaching moment.