How about tracking the users pulse while he reads your website via his smartwatch. Wouldn't that give you even more insights into the emotional journey? My poi

How about tracking the users pulse while he reads your website via his smartwatch. Wouldn't that give you even more insights into the emotional journey? My point is: You have to draw the line somewhere (and I think the GDPR line is very reasonable). If you are a business relying on having a perfect website, you can use other means like UX labs.