You may be underestimating the role of targeting in conversion optimization, and I'm not sure how you could better target individuals than based on what they're thinking at any given moment (literally).

For instance, it's not hard to imagine a future where gen-ai inserts product placement for a drug like ozempic into your favorite show, just for your view, while you're actively paying attention, even though you didn't realize at that moment you're still a bit upset about a negative comment someone made about your weight earlier that day. An advertiser didn't have to select this scenario, but instead you were targeted by an ML algorithm at that moment based on brain activity correlated with others who ultimately were successfully nudged to have a conversation with their doctor about their weight. Simultaneously, another ML optimized the product placement generation to minimize viewer disgust while maximizing its visibility. Your behavior becomes immediate feedback to further optimize these algorithms, as you're tracked for how much attention you paid to the placement, what was your emotional state before and after, did you schedule an appointment with your doctor over the next 3 days, were you prescribed ozempic, etc.

That is just a simple example which isn't that far removed from advertising approaches today. I'm certain there are plenty of clever techniques to turn your thoughts and perceptions into conversions far more effectively once advertisers have real-time access to your brain.