As a regular user who across got used to editing css/js subpages for storing non-css/js content across the years, I want to be able to use/edit them again without worries, e.g. without wondering what CSS/JS even is or should be and without receiving a warning I don't undestand.
Cf. https://meta.wikimedia.org/wiki/GlobalCssJs for a more limited case; cf. "MediaWiki should allow creation of empty pages" bug, which I can't find due to T85303/T1375 and T76942+T85302.
For a start, a bot could comment out all the content in EditCounterOptIn.js subpages.