Hey
The only cited example of real breakage so far has been mismatched <div>s. How often are you or anyone else adding <div>s to pages? In my experience, most users rely on MediaWiki templates for any kind of complex markup.
I don't know how up to date this manual page is, but mediawiki.org explicitly states that templates copied from wikipedias may need to have tidy activated in order to work properly [1]. The old Template:Infobox (before Scribunto) sure did...
[1]: https://www.mediawiki.org/wiki/Manual:Using_content_from_Wikipedia#HTMLTidy
Regards, Tobias Oetterer
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