We are making the changes from the PR https://github.com/discourse/discourse/pull/10563 the default behaviour. Now, if secure media is enabled, secure images will be embedded in emails by default instead of redacting them and displaying a message. This will be a nicer overall experience by default, and for forums that want to be super strict with redaction this setting can always be disabled.
This pull request has been mentioned on Discourse Meta. There might be relevant details there: