I don’t use the same subject keywords the article describes, but I try to keep it concise. I put the point of the email first, a bit of background, and further explanation below that if required. I don’t think anybody really appreciates the beating around the bush and story telling that goes into a lot of corporate emails.
[0]: https://hbr.org/2016/11/how-to-write-email-with-military-pre...