I would like to point your attention to [https://translatewiki.net/wiki/MediaWiki:Titleprotected/en this message]'s [https://translatewiki.net/w/i.php?title=MediaWiki:Titleprotected/en&action=history history].
The changes are:
<nowiki>''$2'' ---> "<i>$2</i>" ---> "''$2''" ---> "<em>$2</em>" ---> <em>$2</em></nowiki>
Every change fuzzied every translation made until every one of thoose changes occured. In particular, the last one fuzzied over 200 tranlations. As a reminder, marking a message as fuzzy means that the translated message will be back to the English source until someone confirms or changes the translation. And we are taking about a message in "MediaWiki core".
Is this necessary/desired? Have developers been informed about the consequences of their changes to English source messages marked for translation, the number of current translations, the numbers of final users affected, and the time that they required from '''volunteer''' translators?