[onei]

It's more complicated than that. MediaWiki is PHP based because back when it was developed PHP was everywhere. Since then the world has moved on, but PHP still powers a huge percentage of the web via things like WordPress.

The other side to using PHP was having support in other host providers. Wikipedia is not the only installation of MediaWiki and there has been consideration in the past for those installing MediaWiki on shared hosts where you don't necessarily have root access to install things like node. Moving forward that's less of a concern because you can containerise MediaWiki (and the other services), but not even Wikimedia run that in production yet AFAIK.

However, even if they weren't budget constrained (which they aren't) unifying on a single language used by the majority of their devs isn't a bad idea, especially when the effort to port the entire stack to a new language would be unjustifiable.