I think it would be nice if a magic word was added that displayed the amount of extensions that a user has enabled in their MediaWiki installation along with a column in either Special:Statistics or Special:Version. Especially on large MediaWiki installations that have lots of extensions enabled such as Wikipedia & all the other Wikimedia Foundation sites that run the software.
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In general, we don't add things to core unless we expect that most of our users will use them.
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Any added code creates maintenance costs. See https://www.mediawiki.org/wiki/How_to_report_a_bug - "A description of what you would like to achieve, and why."