What you say is absolutely correct. There are other fields (such as prow_ref, designation) etc. for holding those other bits of information, and there are maps that show those.
I wouldn’t be too hard on this particular mapper though - they are very new (17 edits or so?) and they may need a bit of help understanding what their options are for other tags and other maps.
Perhaps add a “hello and welcome” comment to one of their changesets and invite them to discuss it here? I’m sure that people would be able to help.