I'm guessing this message came in while I was in the process of sending out the message, as I have mass unsubscribed everyone from that task based on feedback from yourself on https://phabricator.wikimedia.org/T252467#6134791. I had to do this via a script which took a little longer than anticipated as Phabricator doesn't have the facility to unsubscribe all.
> Subscribing them means that every comment and change results in them receiving an email about it, pointing to a confusing page on a mostly-unfamiliar platform, often about an issue they know nothing about.
This is only true if they don't unsubscribe or are not mass unsubscribed by the task creator. In this particular tech notice I have unsubscribed everyone after adding them. My understanding is all the people I subscribed should get one email relating to the notice itself.
It would help me to understand where you are coming from. This technical work is important to fix and we don't have a good process yet for communicating with editors to make these changes.
My current approach is
1) identify potential editors
2) Ping them on phab ticket
3) unsubscribe all and ensure they are not in the description so they don't get further notifications.
I did try an alternative approach on wiki but Echo only works if users have been present on that wiki so it was not a very useful mechanism for targeting users across several wikis. For me posting to every user talk page on the target wiki doesn't scale as there is no bot I know of that does that.
I am open to ideas for improvement if you have a better approach, but I don't see one right now other than break things and expect editors to fix retroactively which seems like a far worse situation than a minor annoyance of being pinged on a phabricator ticket.
Am open to any ideas you have.