I ran across Roam Research in late 2019, and in exploring TiddlyWiki lately I’m seeing a lot about people adding Roam-based functionality to TW5. What I’m not seeing is any conversation about how the same sort of backlinking could be done in MediaWiki. 
Of course I did mention something related the other day, but the functionality could be better surfaced:

One of my favorite “hidden” features of the IndieWeb wiki is the sidebar link for “What links here” that often provides some deeper and richer information than is found in the See Also sections.