Language is a very poor substitute for freely flowing electrical information - it is evolved to compensate for the bottlenecks to external communication - bottlenecks that are lacking an internal analogue.
It's also a highly advanced feature - something as heavily optiimised as evolved life would not allow something as vital as cognition to be hampered by a lack of means for high fidelity external expression.
Language is designed to be expressible with low fidelity vibrating strings - it is very clear that the available bandwidth is in the order of bytes per second.
Verses a fucking neural network with ~100 billion neurons.
Come on man, seriously - the two communication modalities are completely incomparable.