Why then is it displayed?

And why are meta-tags a "narrow view" of the web. If you think meta-tags should be deprecated, you could suggest that to WHATWG - currently they are a valid, standardised element for which this seems a perfectly appropriate use. At least they don't litter the page with elements useless to any UA not supporting this functionality.

The only argument one could level against this implementation is that they haven't proposed the individual meta values for standardisation - a point I'd agree with if anyone had made it. That they should do.