Alignment and understanding the product: As engineers it is easy to dismiss their task as conveying how the product works and defer to "it is implemented!".
I have stup a goal to post in the non-engineering Slack channels at least a couple of times with a video of how new features work, or give a short introduction on "that new testing framework" in human language.
Doing so is first and foremost a proactive move. Secondly it takes away the excuse of not knowing what eng is up to.