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Barriers are not restricted to langauge, and let's not forget that translators (machine translators) do not get "tone"- at all.

We have to realize machine translation will ONLY improve in the next 5-10 years (which is about how long it will take for steem to go mainstream anyway) and will still be workable if one is looking for the content of thoughts as opposed to perfect grammar and eloquent, flowery verbage.
Additionally it is STILL far better a solution than this proposal.