A returning account is:
These accounts can be assimilated as newcomers. As a consequence, they would benefit from our features. This task is about thinking how we can offer our tools to these users and invite them to use them.
See also T290866: Provide notification about availability of add link feature which talks about notifications for a specific feature, but we could announce Special:Homepage in a notification to these users.
@Trizek-WMF I'm moving this to Triaged, but please change to another column/board as you see fit. Thanks!
I think this is something we should discuss about, as a possible way to scale and as a complement to T292090: Research Spike: Enable Growth features for autocreated accounts (if the user already has Growth features).
It seems hard to differentiate between the conceptual equivalents of creation and autocreation here - what if an experienced user, who is continuously active on their home wiki, has visited some other wiki once years ago, and is now visiting it again?