At risk of getting thrown off the damn roof this is the problem I'm solving with my current product.

You've pretty much got the gist of it, the way we're going after the problem is producing internal notes rolled up from the code changes, and the main thing that changes as we move that communication from internal to external is frequency and delivery method.

We're still fairly early, but I think it's a mistake to think the contents of that communication should change. As soon as you get past the developers who wrote the code the primary thing people care about is customer benefit and how this work contextualizes into our goals, so we start there.

Internal comms comes out in internal channels (eg, Slack), and gets updated frequently (> 1x a week). As we bring that message out to customers we offer more self serve options (eg, hosted URL, embedded widget), and then only recommend pushing a notification once a month in the form of a recap.

(But you should still have a place that potential customers can see all the work your team is doing)

Would love to talk more on it, and thanks for brining this question up, very cool to see all the responses.