From 2018-2022, the Growth team developed a variety of features related to activating and retaining newcomer editors.

Some of those features and/or the components used to build those features could potentially be moved into MediaWiki core. The reasons to do so are:

• these components are useful to multiple use-cases
• out-of-the-box behavior in MediaWiki is improved with these features
• we might see further development of these components in a shared repository (mediawiki/core) rather than in GrowthExperiments extension, which tends to have contributions only from Growth team engineers