what the context for this statement is?

The only way to find out the changes between versions that should be in a changelog is by studying sldev, and occasionally asking questions

sldev may be irritating because no user suggestions are ever applied, but it is the only place that one can ever find out what has changed.

subscribe with an email address you can't send out email which that info is not set in the mail program. That way you don't ask ...

... questions or make suggestions, hence can not be disappointed?