Hello,
By changing this from the tag that people knew about to one that they don't it means that features like this disappear off maps again (or rather - see http://map.atownsend.org.uk/maps/map/map.html#18/54.37823/-1.96709 - fall back to be shown as a generic archaeological site).

Obviously these sorts of things becoming more known as defended settlements (often constructed in a "look at me" kind of way).  They are very definitely still "defended fortifications" as well as settlements though.

Is it really too much to ask that rendering-breaking tag changes like this are at least mentioned somewhere first?  https://community.openstreetmap.org/c/general/tagging/70 or maybe https://community.openstreetmap.org/c/help-and-support/tagging/71 would be a good place to mention it; you can also contact any advertised data consumers from e.g. https://taginfo.openstreetmap.org/keys/archaeological_site#projects - if you click through to the project from there you'll be able to e.g. raise a github issue.
Best Regards,
Andy
