Generally speaking we want slashes in TAG! to work.
For close tags of course:
<head> </head>
But I don't see anything wrong with:
</head/>
I use TAG! for module relative path filenames, e.g. import <subdir/file.r> and I can imagine reasonable applications that would be directories.
The TAG! usages are plentiful and useful, and override the value of being able to call a function < with a refinement >, which never happens.