Modern email clients use threading and quote-hiding to make everything look like bottom-posting. People who want to see context for your reply can just look up

Modern email clients use threading and quote-hiding to make everything look like bottom-posting. People who want to see context for your reply can just look up and see previous messages. I agree that you want discussion posts in chronological order, oldest to newest reading down, whether this is on a blog or email, but technology has changed so that this is no longer the responsibility of the poster.