That doesn't seem to correspond to the attitudes of salesmen vs engineers. I'm not sure what salesmen you're thinking of, but few of the people in sales I've talked to can have an in-depth discussion about how React.createClass vs Class ___ extends React.component will effect "this" context, and how super(props) pattern works in the latter. Furthermore, lots of engineers who work with any given language/framework can't explain it either, and many of them have basically been copy-pasting until stuff worked their whole career.

I've found that most people who have poor communication skills are not good engineers either* and the two might actually be related.

*Except for substack