$wgIncludeLegacyJavaScript is false per default, and per the documentation there should be no need for it to be true. It's also disabled for mobile page views. CommonSettings is initializing it to true. is that still needed? Can we disable it for everything?
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Yes it's needed. It keeps user scripts working. We have a task already. Most of the work towards phasing it out has been through client-side deprecations and those have also been removed already. What's left, I intent to copy into mw.loader and the setting can then be removed.