$wgVectorResponsive is only enabled on testwiki and doesn't appear to be used elsewhere. As the configuration was introduced about four years ago, it seems unlikely to suddenly become popular and is most probably a good candidate for removal.
- The new Vector is seen as a worthy replacement for the flag.
- $wgVectorResponsive turns on the Skin responsive option for the modern skin.
- skins.vector.styles.responsive is removed from the codebase
- Check that test wiki mobile domain loaded in mobile adapts to the viewport.
QA Results - Prod