@zverik If you want a place to start: when viewing a changeset (e.g. openstreetmap.org/changeset/10 ) it's a perfect opportunity to link to various other websites that offer much more useful diff viewing. I somehow knew about OSMCha, but just discovered achavi overpass-api.de/achavi/?change a few minutes ago pretty randomly. Adding links to these external viewers in osm.org would eliminate the frustration of having to seek out a proper diff for a newbie.