Um, yeah. In fact, facial recognition is fraught with bias and error, and people can easily cover their emotions. Ever hear of a poker face?
Here's a thought exercise: Try to communicate to your spouse where their keys are inside your house using only facial expressions...
Or try to order a pizza...not using words...but by using inflections and noise alone.
The fact is, words are what we use to label and categorize our world. It's the vehicle in which we codify our thoughts. Voice inflections and quirks, and the physiological expressions only add additional information on the words that are used.
V.E.R.N.'s accuracy of 80%+ in internal and real-world applications is on words ALONE. Just imagine how powerful your emotional recognition would be with V.E.R.N.
...because it's not as accurate without it.