This variable was supposed to be a temporary way for wikis to adjust their home page. It is badly documented and has confusing behaviour.
Let's disable this by default on new wiki installs and encourage editors to fix these issues in templates and on wiki.
- Set the default to false in MobileFrontend
- Any projects that are currently making use of it should override this in the Wikimedia MediaWiki config to be enabled.
- Update documentation to discourage the usage of the config and encourage fixing templates to fix mobile views (https://www.mediawiki.org/wiki/Extension:MobileFrontend#Configuring_the_main_page)
- Update internal documentation in MobileFrontend README