In Wikipedia and Wikimedia Commons, I would like to have the option to receive an email whenever a page changes for any reason, and I wouldn't want the emails to stop if I didn't visit the page while logged-in.
This would enable me to monitor changes from my email client. and not worry about visiting pages.
Ideally the emails would contain details of the page changes they are notifying about.
This is how email notifications work in the Phabricator system.
(The Wikipeda Watchlist page only allows viewing changes over the last 30 days, so again changes could be missed, if emails had stopped and the user hadn't realised. Increasing the 30 days is not a fix for this task, though.)
I would like the emails to stop after a long time, though, for after I am gone from this world, someone else could get my email address and receive these emails! Then they might get access to my Wiki account!
I think change notifications are a key part of Wikipedia, and should be powerful, flexible, transparent and easy to use.
Task T110850 is related to this, because it details a bug reported in the current email notifications system, and has discussions of the current system.
The current situation where emails stop if the page is not visited is unreliable as a system - the user only needs to forget to log in once, and they could miss many changes.