Section auto-numbering (https://www.mediawiki.org/wiki/Manual:Table_of_contents#Auto-numbering) is, IMO, one of the worst ideas in MediaWiki that has survived to the present day. It makes every article look like a legal treatise instead of something designed to be read by a normal human being.
Strangely, you can actually add auto-numbering to the headers themselves (an even worse idea), but you can't remove it entirely.
It's time for us to adopt a kinder, gentler table of contents and get rid of all the '220.127.116.11's and '18.104.22.168's. I'm sure many years ago (when most articles were stubs or only had one level of headers) it seemed harmless enough, but these days some ToCs have more numbers than words.
I see that WikiVoyage has wisely decided to eschew the numbering. We should learn from our new comrades and adopt this strange but elegant Western fashion as our own.
My proposal would be to turn off all auto-numbering by default, but allow any hard-line loyalists to re-enable it in the preferences. The option to turn on header auto-numbering, however, should be sent to the firing squad.
If this is deemed too radical by others in the politburo, perhaps we could at least introduce an option to turn off auto-numbering in the preferences for those wishing to escape the tyranny of numbers.