I really like how they have opted to make small changes gradually. Look at the feature lists here https://m.mediawiki.org/wiki/Reading/Web/Desktop_Improvement.... There's a detailed explanation for why each change is being made complimented by a GIF showing the side by side difference. I've been working on an SPA with a tight deadline and we are building new pages almost every other day. It's nice to see a project take a slow and careful approach.
