Inspired by T271294 I suggest ot disable the possibility to blank message documentation pages (qqq). This can lead to confusion on various sided,
qqq are there for documentation. I see no valid reason to blank such pages.
Possible solution: Create an abuse filter. A message documentation should have a length of at least 5 (?) characters. This would prohibit to fool the filter with text like "-" or similar
Maybe limited to the MediaWiki namespace because I do not have overview over the needs of the other projects.