The current state of browser tracking preventions also means that you’re unlikely to identify conversions from the same user that saw your experiment after a week or sometimes even 24 hours.
Sites can only optimize for what they can see and we've made it so they can only see short-term engagement.
Another is all the annoying cookie popups as a result of GDPR.
If sites are having trouble converting me, perhaps it's not me that's the problem.
It's somewhat amusing that the overlap of garbage content farms and sites with annoying consent popups is almost perfect. I wonder if it could be used for search engine ranking.