Computers history taught me that high resolution is not needed to achieve complex forms of communications (for instance ascii had 3 level deep structure separator, pretty much ignored). I feel like an 4K version of a fish, sure I may have finer and more complex communication scheme, but that doesn't mean they don't communicate the same idea between each others through different and simpler means.
About voice control, most people don't even understand what they do with it. Ask someone to modulate vowels to match a foreign accent. Or sing. The variations between airflow, tone, timbre, etc... Then you start to understand a bit more about what your vocal apparatus can do.