<meta> tags are useful in many situations. I recently created a blog that I needed to apply the RTA (Restricted to Adults) label, in addition to a “noindex, nofollow, noarchive” for Googlebot and other crawlers.
Of course it’s possible to inject <meta> tags through JavaScript, but I’ve always found that method clunky and, more importantly, a crawler unable to render JavaScript codes might ignore my tags altogether.
It would be tremendously helpful if we have the ability to add or edit <meta> tags on our own.