Because T235752: Undeploy the GettingStarted extension felt bumpy and more like "individuals try to remember random places".
Tagging as Code-Stewardship-Reviews because trying to find existing docs, https://www.mediawiki.org/wiki/Sunsetting_Working_Group says it's been superseded by https://www.mediawiki.org/wiki/Code_stewardship_reviews which links to https://www.mediawiki.org/wiki/Technical_Debt_Program which hasn't seen updates since 2018.
Related:
- Projects-Cleanup instructions in https://phabricator.wikimedia.org/project/profile/2829/
- https://www.mediawiki.org/wiki/Gerrit/Inactive_projects (probably outdated and superseded by Code Stewardship reviews by now?)
- Pages like https://www.mediawiki.org/wiki/Reading/Web/Sunsetting_a_project (there might be more)
- Tasks which have comments which cover some steps. See e.g. T235752#7368776, T235752#7399147, T235752#7399456, T235752#7404499.
This is different from archiving a codebase, that would be T198059: Document typical criteria used to decide whether an extension or skin should be archived (with e.g. T292654: Archive the GettingStarted extension being affected)
The topic was probably already discussed in 2019 in T234657#5667000 with no outcome.