The biggest thing I've seen that's changed in the past 10 years is the creation and refinement of the VisualEditor extension. It's a great tool for self-hosted mediawiki when you have a bunch of relatively non technical users, who are not comfortable with editing wiki 'code'.

https://www.mediawiki.org/wiki/Extension:VisualEditor

VisualEditor is what you get by default now when you go to edit a wikipedia page, unless you specifically click on the option to edit source.