I would love to see usage metrics on that. Probably well below 1% of all browsing sessions, quite possibly even less than 0.1%.

Nobody asked to this. Interpreting websites for its users is categorically not what a web browser is for.

Summarizing a long article (possibly in a language I don't speak), querying it for specific information without having to come up with an exact greppable substring etc. is absolute what web browsers are for.