Our maps would greatly benefit from hillside shading, especially for articles about natural features. Community link: https://www.mediawiki.org/wiki/Help_talk:Extension:Kartographer#Topographical_details
Note:
There is an optional volunteer run layer available already in the form of
var WMFLabs_Hill shading = L.tileLayer('http://{s}.tiles.wmflabs.org/hillshading/{z}/{x}/{y}.png', { subdomains: ["a", "b", "c"], attribution: 'Wikimedia Labs | Map data © <a href="https://openstreetmap.org/copyright">OpenStreetMap contributors</a', maxZoom: 16 });
but this ticket is about bringing that to the official Wikimedia maps (either by default or as a layer).