> It's not a hard concept, but it's a concept that was only ever explained in school to a sliver of the population actually using email every day. It's not har

> It's not a hard concept, but it's a concept that was only ever explained in school to a sliver of the population actually using email every day. It's not hard to someone with exposure to a certain medium. Though its a bit dismissive like it would be for a mechanic to question why a person doesn't know know about rotors, spark plugs and other "simple" car concepts.