IDK why the right is needless, I have a bot running a task to fix pages by null editing whole page in a non-WMF wiki, and there are always pages cannot be edited because they included spam links come from meta-wiki blacklist.

Although setting the $wgResourceLoaderValidateJS to false is too dangerous, why not add a feature to support validating es6 or higher version JS for the site which dont care about IE visitor?