Yes, despite its agnostic branding and name indicating basically totally maximal scope, schema.org has basically the features Google's interested in supporting

Yes, despite its agnostic branding and name indicating basically totally maximal scope, schema.org has basically the features Google's interested in supporting for pulling out things from pages and emails. To the extent that other uses can basically piggyback on data that sites added to target Google, it does provide some value, but I don't see it as really even attempting to be a generally useful "semantic web" or linked data vocabulary in the sense of interoperating with other things.