I wonder whether a Wikimedia Editing newsletter wouldn't be better than separate VisualEditor and Collaboration newsletters. While the teams and liaisons are different, do the audiences of these newsletters really care?

Whoever is interested in VE probably is interested in other news about new features for editors, don't you think? Keeping two different newsletters well maintained and publicized with high levels of subscriptions is a lot harder than focusing in one good newsletter with a focus on Editing.

Good question... What about people who hate VE and don't want to hear about it, but like Notifications? (I pick this case because I know it exists.)

I sure multiplying channels is not necessarily the best idea ever (because we would have to rebuilt a base of users, and write things with common points), but we really need to think about it carefully.

I for one don't care much about all the things-Editing.
For existing products, much of the interest depends on specific community history with those products.
Some people subscribe because they want to learn about the new shiny features which have become available in time,
but several others do because they want to know in advance whether we're planning changes they won't like and need to object to ASAP.
The VE newsletter is pretty long. Publishing one each 2 months is the ideal rhythm for us and has been sustainable so far for translators (we've already tried other frequencies).
I'd say, let's not fix something which isn't broken :)

@Trizek-WMF, have you considered this for the Q2 goals?

Yes, as a personal goal, after the recent updates on T123538: Rethink the way we communicate with communities concerning Collaboration team work.
The collaboration team will have two meetings about that this week.

First issue will be sent on Monday.