Take the Romance languages, for example. Most of which are generally the same language, in general word order and rough construction of words, but different languages have different norms for the different cultures. Italians have much different cultural values than the British do. Neither one is intrinsically better, and that is not the avenue of discussion, but English and Italian are two entirely different languages. Italian is a language of beauty, love, and royalty. English is a language of business, taking influence and being bastardized over the years to for it.
I think it is perhaps a bit much to say that words always obscure feelings, as poetry is the means of communicating feelings through words, and that would be impossible without an extensive vocabulary. Look at Orwell's "1984" and its proposed "Newspeak". Poetry and emotion are impossible in such a system where an abstractions such as love would be impossible to convey, and could only be described by such terms as "being double-plus-good" at best.