Having amazing machine translation capability doesn't make it any easier for humans to learn a language.
And the "richness of expression" argument doesn't really hold water in such a reality – if there are things that "can't be easily expressed in English that can be expressed in Chinese", then your magical auto-translator presumably won't be able to actually convey what you're trying to convey if you say it in Chinese and want it translated to English. If the translator can accurately express your meaning, then the initial premise is invalid, no?
> if there are things that "can't be easily expressed in English that can be expressed in Chinese"
I didn't say that there are things that can't be easily expressed, but rather that certain languages are better suited for expressing certain things, or at the very least, opinionated in particular desirable ways. We're talking about the form, not the content.
In any case, yeah, I might be mixing the idea of a cyborg that speaks/understands all languages with a universal translator machine. It seems like these two things will eventually coalesce, though.
And the "richness of expression" argument doesn't really hold water in such a reality – if there are things that "can't be easily expressed in English that can be expressed in Chinese", then your magical auto-translator presumably won't be able to actually convey what you're trying to convey if you say it in Chinese and want it translated to English. If the translator can accurately express your meaning, then the initial premise is invalid, no?