I'm not the least bit skeptical of this vision, but that's because I see direct use along Facebook's (Meta's) business model.
If you are selling advertising (influencing) access to a population through heightened metrics and more ability to target amenable customers, there are many useful things you can learn and correlate through things like delay before click-through, where the mouse pointer hovers, and so on. This is done on a massive scale and it's extremely revealing, allowing for deep and fascinating connections into the human subconscious.
This is NOTHING to what you'd get tracking micro-expressions on the human face, something that is largely involuntary on a whole different scale.
This is like mapping the human genome, but for human behavior. It's absolutely revolutionary. Even with the most primitive recognition the big data generated will be transformative.
The inevitable result, WHOEVER does this (if it isn't Facebook, it'll be somebody else. If it isn't the soulless commercial sphere it'll instead be the government. Or 'all of the above') will be this outcome: you can then pay to manipulate entire populations to your whims. All you have to do is have an outcome, a plausible means of influencing them, and this ability to micro-target everyone who is susceptible to your message and skip over anyone who might whistle-blow on you or raise a coordinated objection.
This… changes the conditions under which democracy is practiced, and under which anti-democracy can be consistently maintained. It's a technology that is easily wielded by just plain old humans that are no smarter than the 'masses' to be manipulated.
The really interesting question is what happens when AI or larger-than-human frameworks get involved and have this technology. If there is a Singularity, there will be no objections. If AI rules us, it'll be as the domesticated animals we essentially are, and there will be no call for tyranny and widespread violence: if anything, this suggests that violence and horror become artifacts of fallible human implementation of these things. The more sophisticated use of it will be bloodless, with any desired outcome 'willingly' adopted by the populations targeted.