I would say tracking conversions is the most important part. There’s always a lot of attention on targeting because it’s user-facing, creepy, and strikes a nerve with the HN crowd. But anyone that has spent five minutes working with their marketing people or implementing adTech would know the true story.

“Are these ads effective? Should we spend more money on them?” Without conversion data the answer is one big shrug emoji.

I don’t believe most companies in the tech industry care about tracking/fingerprinting users for the sake of collecting & reselling their data. First hand experience, I’m just not ever seeing that. They just want to know if their ads are working or not.