Comment by ashtonkem

You’re right that there’s no hard constitutional requirement that electors vote for for whoever won the popular vote in their state or district, but there is absolutely a strong cultural expectation that electors act faithfully. Also, it’s illegal in many states for electors to act faithlessly.

I think this is a bit like saying that the UK has no constitution because it’s not written down. It’s technically true, but it comes nowhere close to the actual lived experience of the people in that jurisdiction, who absolutely believe they live in a constitutional society.