But if closing tags are allowed to be unnamed, you are still one misplaced </> away from unrecognizably maiming the entire hierarchical structure, just like one

But if closing tags are allowed to be unnamed, you are still one misplaced </> away from unrecognizably maiming the entire hierarchical structure, just like one incorrect indent can do in YAML. Ultimately, what matters is the editing mode and not the data format. Good syntax highlighting and autocompletion goes a long way towards safely editing structured text, regardless of on-disk format.